Fradulent Proof of payment for supply of goods received.

I have encountered this company with email request to supply goods as per our webpage. An invoice was sent to said company email. The next day the owner Stanley Thwala called to confirm that I received payment. After proof of payment was received via email it was for "storage" nothing to do with our invoice and email. The amount was for R66 600.00 as per enclosed "Nedbank Internet Proof" Mr. S. Thwala phoned me again to explain the problem that occurred was due to his wife's human error. He wanted me to use this funds to pay for the goods and then the balance can be paid back to him. I was unwilling to do this and he dropped the phone. 3 days later I confirmed from nedbank that the proof of payment was completely **********. I phoned Mr. Thwala, but he would return my call within a hour after checking with his wife, he never did and now my calls are screened and not answered like before. The cell number in question is ***. The company VAT number ***