5318008?
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so in effect the money has probably gone to someone else
Yes. Itās probably made someoneās day waking up to a large payment
Account numbers for the majority of banks use modulus checking to prevent mistakes - not all banks use the same method, so the sort code is used to decide which modulus check calculation to use. There are very limited circumstances in which transpositions can occur and still pass a modulus check.
There are various software products available which take details of all the banksā modulus check methods and bring this together in one place, such as this one from Experian: What is Bank Wizard
If an organisation wishes to process Direct Debit requests via online sign up, Bacs require them to implement such a system at the point the sort code and account details are keyed.
(Edit - not all banks use modulus checking on their account numbers)
(Edit 2 - this is not the same as Confirmation of Payee)
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Just make sure you ring on Monday to correct the error, when was the payment due to hit you account? Donāt know if I missed that bit or not.
Edit - ignore this just saw the other post
Sort code 04-00-04 Monzo account number use the same Luhn check digit calculation as card numbers, so valid account numbers always differ in at least two digits.
(04-00-{03,05,06} use slightly different check digit rules in part to make sure that if account numbers valid under one sort code arenāt valid under another to minimize risk of confusion. The same principle still applies though - minimum two digits differ)
You can find the tables used to validate UK bank account numbers on Vocalinkās website
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so what does that mean sir, do you mind explaining as I have adult learning difficulties
Itās the answer to your question.
No it is not possible to have a one digit difference in your Monzo account number. Account numbers always differ by at least 2 digits.
so is it impossible for someone to have [redacted] and someone to have [redacted] as the account numbers. you said 2 numbers must be different @Ordog I have learning difficulties I canāt really understand all this
Iād that your actual account number? It looks like what you posted yesterday that was removed
deleted as I think Iām wrong 
Youāre stressing yourself out needlessly. Whatever the rules are for account numbers are, itās not going to fix your current situation. If you have learning difficulties, do you have someone who helps you? Someone who could read all this and explain it to you?
All you can do is wait for Monzo to investigate and get back to you, itās not a simple two minute thing. Be patient and try not to worry yourself.
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Actually, Iām not sure this is not completely true if you look at Monzoās modulus checking rule. There are two specific places (3rd and 6th digits) in which a single digit error can still result in a valid account number.
Iām not an expert in it but the below person is and used to work at Monzo. I just rephrased this part but perhaps Iāve got it wrong?
Hey @kallem5th, Iāve edited your posts to remove your account number for security.
If you havenāt already, itās best to contact Monzo directly in chat as theyāll be able to help advise on any next steps with your payment having been sent to the wrong account number. This forum is a public space largely among customers, so the in-app chat with Monzo is the best place to ask for help on this 
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it was the 6th digit that was incorrect . for example xxxxx3xx when it was ment to be xxxxx9xx
As others have said over and over nowā¦ Sit back and wait for Monzo to get back to you.
Rehashing the story and asking more questions is only going to get you more worked up.
Once theyāve finished looking into it theyāll be in contact via chat.
I have and monzo have said nothing they can do. about this
Speak to DWP tomorrow if you havenāt already. If / when the payment gets returned theyāll soon be in contact to get it re-issued to the correct account. Theyāll provide advice on what else they can do if at all possible.
Even if thatās the case, as @EllieC has pointed out to multiple times the public space of the forum really isnāt the place for this discussion.
I am really sorry for everything you are going through but there is literally nothing anyone here can do for you and I genuinely donāt believe youāre getting any benefit from continuing to discuss it here.
I canāt beleive I am about to suggest this (as closing threads normally annoys me), but it might be time for @SouthseaOne, @Peter_G, @AlanDoe or @Feathers to shut this down (sorry to mention you all but I donāt know whoās around).
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I agree. You mentioned that you have a social worker in your other topic.
Continue working with them if youāre struggling and also pressure the DWP to try and retrieve the payment from their end.
Hope you get it sorted 
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