Really really bad service

HI not the best experience took my car in for a DPF and EGR removal with software and stage 1 after receiving the vehicle back went on into limp mode with a variety of excuses then paid an additional cost to have that specific error removed with no luck still did the same took the car back and said it must get sorted vehicle was running fine the day i brought it in before everything was done. They said fine they will open the turbo and clean the vanes as they are sticking came back after they where finished and wanted to charge me an additional R2250 for the cleaning of the turbo i refused after a long discussions and back an forth they said they will wave the fee if i sign a document stating they will not help me in the future o course i declined needless to say car still goes into limb mode after R6300+R750 =R7050 this excludes the R2250 they wanted me to pay for a problem still there is been more than 2 weeks with no reply back regarding a new electronic turbo actuator which is gonna cost me now an additional R4500 this service was good in the beginning but quickly went bad as soon as you start asking questions reply is i did not touch the turbo actuator and that fault has always been there WILL NEVER RECOMMEND THEM TO ANYONE