Bad Service Allen Joss A Ford - Pretoria

I took my car for Mechanicals on the 25th of July 2023, I paid R1900 they insured that the car is fixed they even wrote on the invoice " REPAIR PUSH BACK PIN IN PCM PLUG AND CLEAN CONNECTORS, TEST DROVE VEHICLE ALL OK IF THIS HAPPENS AGAIN THE PCM NEEDS TO BE REPLACED" now the vehicle is repeating the same problem I took it back now they gave a different Quotation not related to PCM and they say they are not sure if this will be fixed. and they also made me pay another R1200 for diagnosing the car that they checked previously. I'm really not happy the way they treat customers, at least they should have explained that I have to pay again for fixing nothing.