Account frozen

On the 18 of April 2022 I received funds from someone I was selling a gearbox to at the time I didn’t have card cause it was lost and it was a holiday but when I go to Capitec Bank the following day I found that my account was frozen cause the person who transfer the funds went to the and told them I ***** him but he took the Gearbox at capitec they told me nothing they can do

What I don’t understand is that what does the person who reported that I ***** his to prove that I ***** him cause he should have opened a case against me so how can Capitec just take his words for that cause when I asked at Capitec if there was any case open against me can they give me the case cause when I try to contact the person his number was not working

I’m not sure where to get assistance cause Capitec forensic don’t talk to clients so how i they investigating a case if they talk to the party involved.As Capitec clients you can send money to a person then claim it’s a ***** account get frozen simply like that cause they even gave me an option to allow them to reverse the funds so I can continue using my account