REFUSAL TO PAY OUT WHAT IS DUE

I HAVE REPAIRED A CLIENTS VEHICLE AND AFTER GETTING A CLAIM NUMBER,DOING ALL THE WORK, GETTING THE CUSTOMER TO PAY HIS SHARE WHICH WAS R14K AND THEN GIVING THE CLIENT THE VEHICLE,i SUBMITTED MY CLAIM! AFTER A FEW DAYS I CALLED IN JUST FOR THEM TO TELL ME THE CLAIM IS REJECTED BECAUSE I NEVER GOT A AUTHORIZATION LETTER! THIS IS NORMALLY FORWARDED TO ME WITHIN A FEW DAYS AFTER GETTING MY CLAIM NUMBER.UNFORTUNATELY WE WERE IN THE PROCESS OF MOVING PREMISES IN THE TIME OF ALL THE REPAIRS AND HENCE DID NOT GET BACK TO THEM AS WE WOULD HAVE LIKE TO. THE CLIENT HAD PAID HIS SHARE AND WE LET THE VEHICLE GO. AFTER NUMEROUS CALLS AND EVEN ASKING THE MANAGER(MR GIOVANNI REDDY) TO CALL OR EVEN SEND ME NOTICE OF THE CLAIM BEING REJECTED THEY HAVE NOT DONE SO. FROM THE 05/05/2021, 10/05/2021,12/05/2021,17/05/2021 THIS DAY THEY KEPT ME ON THE PHONE FOR 1HR 12MIN AND 52 SECONDS AND STILL NO MANAGER OR EMAIL TO TELL ME MY CLAIM IS REJECTED. THEY ALSO USED AN EXCUSE OF THEY PUT IT ON HOLD BECAUSE THEY NEVER GOT A DIAGNOSTIC LOG BUT THE PROBLEM WAS MECHANICAL AND NOT ELECTRICAL. THEREFOR THE FAULT WOULD NOT REFLECT ELECTRICALLY. ON THE 31/05/2021 I PHONED AND WANTED TO SPEAK TO MR GIOVANNI REDDY AND WERE KEPT ON THE PHONE OVER 15 MINUTES AND IN THAT TIME NO ONE CAME BACK TO ME. I HAVE DONE WORK PREVIOUSLY FOR INNOVATION GROUP AND I MUST SAY THIS IS THE WORST POSSIBLE SERVICE I HAVE EXPERIENCE,THEY ARE REFUSING TO PAY OUT MY CLAIM OF R10000.00 BASED ON THEIR ARGUMENTATION I NEVER GOT THE AUTHORIZATION NUMBER AND THEN THE DIAGNOSTIC LOG WAS NOT SENT THROUGH AND IT SEEMS THEY ARE PLAYING GAMES AND DON'T WANT TO PAY OUT MY CLAIM. MY CLAIM NUMBER IS 511884 I GOT ON THE 02/05/2021 FOR MY CLIENT MR JOSEPH MOAGI WITH A JETTA 1.4TFSI 2010 REG NUMBER HBM797MP.