POOR SERVICE BY MERCEDES BENZ , JOHN WILLIAMS MOTORS BLOEMFONTEIN.

I have a complaint against poor service received from John Williams Motors Bloemfontein.

MY CAR HAS 40 000 KM ON THE CLOCK.
IT IS ON ITS SECOND SET OF TYRES AND I DETECTED EXTREME WEAR ON MY FRONT TYRES ON THE INSIDE TREAD.
THE TREAD ON THE ENGINE SIDES ARE COMPLETELY WORN WHILST THE OUTSIDE TREAD MAY STILL RUN FOR 10 000 KM.
THE BACK TYRES ARE ON IT WAY TO THE SAME STATE OF DISREPAIR.
I PHONED JOHN WILLIAMS MOTORS ON FRIDAY 3 MARCH AND THEY SAID IT COULD BE RECTIFIED UNDER THE SERVICE PLAN.
THE CAR WENT IN ON 7 MARCH. I HAD A CHAT WITH THE WORKSHOP MANAGER JACQUE HEFER AND EXPLAINED MY PROBLEM
AT 17 H 15 MY CAR WAS COLLECTED. NOTHING HAS BEEN DONE.
HEFER CONTEND THAT THREE RIMS ARE BUCKLED AND IF I PAY R 55 201.20 THEY WILL FIT 3 NEW RIMS AND TWO TYRES. PROBLEM SOLVED.
I AM SORRY, BUT HOW WILL IT NOT HAPPEN AGAIN?

Send me someone who can investigate the matter. I want to solve the problem not postpone it.