FNB must unblock my account immediatly

I sold 2 Mercedes Benz engine to a regular customer of mine. The customer made payment into my FNB account on the 3rd of January 2024 from his Capitec Business account. On the 6th of January 2024 I noticed that money was deducted from my account. When i queried this with FNB, FNB has actually blocked my account claiming that my customer reported my account. I then called my customer and he said he did not report my account as he received what he purchased so he is not the one who reported my account and why would he do that when he received what he bought. This matter is not only affecting me but also 2 other people i have made payment to who are also banking with FNB, their account as a result of this are also blocked