Accout was froze. I can't do my business.

Some 1 made a payment of R1420 on my account to buy ustd. They sent me a proof of payment. I received an email from fnb. Complaint Ref number : ***. Acc name Semasoftech(pty) Ltd. Have tried calling the numbers of thee investigating officer but they are off. When went to the bank they where telling me to call the ***** department but they don't respond.