Bad customer service

I bought a car with we buy cars,the sales person advice me to reserve the car with R5000,I will get a refund when the car is approved or not approved. I paid the R5000,the car was approved,I didn't get the refund, I asked the Samantha who was assisting me with signing the car papers,she said I receive my money within a week,a week it's over now,no refund.I phoned their headquarters for assistance,they also promise the money will be paid,but it didn't.Today I'm here at midstream wanting my refund the same Samantha is still telling me the money will paid within a week again.I ask email or contact number for the person or office that is supposed to make a payment,She said,they are not allowed to give that information and referred me to their website for complaints.why can't I be assisted while I'm at their branch,I use my petrol to come here and data to communicate with them.They don't even care to call or message for communication.It was easy to take my money,now it's difficult to refund me.Im so crossed with their services.