Unprofessional and *****

I refered someone to purchase vehicle and the sales promised I will get R2 500 if the sale is successful, the sale succeed and when they have to pay they ask tax number, and when they pay is no longer the amount we agreed on, they paid R1875.00. When I asked sales person the respond to he said enjoy the money. What is the deduction for he said is tax. I asked him again how many percent and he said go to complain at SARS. , (Capitec: Money In +R1875.00 into SAVINGS ACCOUNT; Ref UNITRANS SALARY TRANSFER ********** 980; Avail R 20-Jun. Call ********** 043)