Frozen Account. Why?

My account has been blocked for alleged ***** and I know nothing about the block or any ***** activities on my account. I have to find out from one of my creditors that they were not able to debit my account due to it being frozen by my bank. This is so unprofessional from the banks end and extremely negligent. They should’ve called or texted or sent an email to notify me of this activity. Ive been on the phone for 3 hours trying to get hold of the Investigator who is handling my case, but he is nowhere to be found. Hi a extension goes unanswered and I’m stressed out because I don’t know what happened to my account. Can someone that’s competent at this bank please call me ASAP.