Poor service and workmaship by John williams

I took my car to John williams mercedes/Fiat branch in bloemfontein in march 2021, I informed them the car (Fiat punto 1.4 lounge 2012) came from another mechanic were he could mot get the timing right and could not find out why is the vehicle still misfiring after fitting all the parts required after the cambelt was cut, I indicated to them the vehicle had missing bolts and that they should replace them as well, the car stood for 8 months at John williams due to them taking long to find spare or faults after they have replaced the ECU?, tensioner, spark plugs and bolts at the end finding it was not the problem since the car was not fixed the problem was still there, later myself around October I was no longer being able to buy the part they wanted to replace which was a multiair unit that cost 12k to buy and install, so I requested my car back which I found out only then that thursday that they were intending to sell it the following with out informing me to recover the job they already did on the vehicle, I went there that friday and paid the amount they requested in full an towed my car which they informed me it needed a multiair unit only it will be fine according to their test, upon inspection of the car as I wanted to sell it as it is I found out that they stripped the engine mounting wholes on the engine, not all bolts were replaced and the workmaship on the car was appauling as reflected on the pictures, I have also been requesting them for the report on the job they did on the vehicle and the old ECU which I wanted back to this day they are coming up with all sorts of excuses instead of giving them to me.