They just block your account with no warning or reason

Being passed around like some platter of snacks because no one you get put through to knows how to help you with a simple request, My credit card account has been put on hold for some weird reason. I transact with this account regularly. Always money going in and out the account and my account is 90% paid up so it's not like I've abused the funds or not paid in money into it regularly. Now i need to pay some bills and it's blocked me from paying bills AND blocked me from even transferring from my cc to my cheque. I can't even do inter account transfers!!?? And I just paid R8300 into that credit card account yesterday. Love taking money but dont like resolving your query to unlbock your account again. I have people depending on me to pay their salary, and my accounts and car payments etc and FNB is just so pathetic, they can't even get back to me with their reason. Or one competent person to handle this issue. No warning, no call, no sms that the account will be put on hold for whatever ridiculous reason. Just boom. You cannot access any of your funds. I am actually shaking I am so upset. Covid has been harsh on any small business. But my accounts I have made sure were always looking well looked after.