Shocking service from SMG Umhlanga Rocks

Smg umhlanga rocks sold me a vehicle without doing a cor,i contacted their manager Imraan to rectify the matter,they asked me to pay for the cor which i did and they promised to refund me which they have not done and its been two weeks,the number plate of the car i did it myself as well and again they promised refund but nothing,the lady i was dealing with Michelle also did nothing after i had furnished them with the invoices and my banking details