Blocked account

My name is Bhekumuzi Wiseman Ndlela, ID number ***, I went to town today to buy groceries, when I was paying at the till my card said insufficient funds, until I went to the bank for enquiries, they told me that my money is on hold because three four transactions that were made to my account by my clients were *****ulent, they paid me using *****ulent money from the scheme, I'm self employed I'm selling products, so I don't know where my clients got their money, and most of them we don't know each other in person so I don't know where they work, now I have been victimized by the bank for closing my account and hold my money for other people who are being investigated and I'm not under investigation according to them, but my account will be closed until they finish the investigation, I can't live without having my account I'm very busy with my account, I need help with this matter.