Why is TD bank closing my account?

I haven't done anything wrong I pay every off and don’t owe anything to the bank but still I get a letter in the mail saying that April 22 my account at TD bank will be closed and I didn’t get a final warning about the letter so naturally I call the bank and they had me on hold so I was already pissed so I cancelling the call and after 10 days I keep calling them and then finally today they called me back and they wouldn’t tell me why they are closing my account I looked is up Online and I’m just confused I have done anything fraudulent but I still get a letter I need help and answer people please I’m so confused in mind you this happened in like the last week of March and then I finally get the call today