I want to reopen account emailed on 4th april still no response
That seems rather slow
You used email@example.com?
Did you email from the address they have registered for you?
Who closed the account? If Monzo closed it, then there may be a reason they’re reluctant to reopen it.
There shouldn’t be any issue with reopening an account otherwise, I shouldn’t think. Are you using the same email address you used for the old account?
Don’t forget you can also call them on 0800 802 1281
Other than this and email there unfortunately isn’t anything that anyone here on the forums can do