extremely poor workmanship

my vehicle's gearbox broke close to nylstroom.i was referred to limpopo auto through one of the petrol attendants where i was stuck. my car was towed to their workshop and after a quote of R 11 000 for a new gearbox and labour i decided to get my own gearbox and provide to them. they quickly jumped to work to repair my vehicle, fitting the new gearbox. the next day i collected my car and on my way back to jhb my gears stopped functioning. i drove in second and fourth gear all the way to my regular workshop to see what happened. i was told my a QUALIFIED mechanic that firstly limpopo auto connected my gear linkages wrongly, loosened my front wheel joints which was not needed and i had to pay R 200 for wheel alignment, they fitted my speedo cable wrongly and the gear on the speedo cable fell into the new gearbox.the cost of labour of over R 3000 for poor workmanship and me having to pay another mechanic to FIX all their problems is unacceptable.i emailed them and i still have not heard anything. not even a sorry or thank you.taking advantage of a stranded person as young as me i feel sorry for other people who find themselves in the same situation. GOOD BYE R 4200......