Holding my money for no given reason & customer service is ignoring me

It’s possible that is because of this:

If so, it’s possible the money DID reach Monzo but it’s also possible that Monzo can’t pass the funds on to you because of the below and also possibly due to instructions from the police.

It’s also entirely possible that the funds bounced and were returned to T212

This isn’t really a matter to be discussing on a forum and there’s nothing we can do here to help you. Your only options are speaking to T212, Monzo or the Ombudsman.