Mazvaal trading did not keep up their promise

Dear sir, Mudum, I am zacharia masolane phali, stays at 14049 balemi street, zone 11 Sebokeng, on 2020.03.12 I went to mazda vereeniging telephone ***, asked for them to check what might be a problem, on my car registration CW 90 JN GP jerking, sales person Delica booked a car for diagnosis I paid R 1 521,74 *** then She said my car need transmission oil replaced, I then came again 2020,05,27, asked the lady who helped Me, Patricia to assist me in jerking of car, She said I must pay diagnosis first, for the second time I paid R 7 200,00 *** diagnosis was car need transmission oil change, cause she convinced me after transmission oil change my car will be fixed, only to find on collecting my car later, my car still the same even after transmission oil change, I explained to her the car is still the same, she said I must buy a new gear box, diagnosis was wrong, I need refund or they fix what ever fault, Mazda they did not keep up their promise. Zacharia Masolane Phali ***