Bumper query/Refund

ON THE 29TH OF SEPTEMBER WE BOUGHT A 2006 MODEL CITRONE C3 BUMPER FROM KOTWALS MOTOR SPARES, UNFORTUNATELY IT WAS NOT AVAILABLE SO THEY HAD TO ORDER IT FORM THEIR SUPPLIER WHICH WE WERE REQUIRED TO PAY A DEPOSIT ON OF R500 UPFRONT. THE INITIAL AMOUNT FOR THE BUMPER WAS R1365. THEN ON THE FIST WE WENT TO COLLECT THE BUMPER AND SETTLE THE OUTSTANDING BALANCE OF R865 WHICH WE DID SETTLE IT AND COLLECTED THE BUMPER ON THAT VERY SAME DAY HOWEVER, WE FOUND OUT THAT THE BUMPER WAS AN INCORRECT MODEL SO WE RETURNED IT ON THE 6TH OF OCTOBER TO REQUEST A REFUND BUT WE WERE TOLD THAT THEY FIRSTLY NEED TO SEND IT BACK TO THEIR SUPPLIER AND WE SHOULD CONTACT THE AFTER A WEEK WHICH WE DID. WE HAVE BEEN TRYING TO FIND OUT ABOUT OUR QUERY BUT THEY KEPT GIVING US NUMEROUS EXCUSES ABOUT NOT BEING ABLE TO GET A HOLD OF THEIR SUPPLIER. SO AFTER SEVERAL ATTEMPTS TO RESOLVE THE ISSUE THEY CHANGED THEIR TUNE CLAIMING THAT THE SUPPLIER FOUND SCRATCHES ON THE BUMPER AND LATER CLAIMED THAT THE BUMPER WAS BROKEN SO THEIR SUPPLIER REFUSES TO TAKE BACK THE BUMPER SO UNFORTUNATELY THEY CANNOT REFUND US. KINDLY ASSIST IN THIS REGARD SINCE WE CANNOT LOOSE THE MONEY WE HAVE SPENT ON IT.