Bad service and workmanship

I sent my vehicle there to get the gearbox repaired, R25000 later I got it back. About a month later I sent the vehicle back a crossmember bold fell out and the greabox was slipping. They towed my vehicle back on a flatbed. I got the vehicle back and 3 of the 4 bolts were totally loose. No nuts on them. I informed them of the fact and that they need to fix it. Now about 1 year on the gearbox is acting up again and they never even bothered getting back to me regarding the loose bolts. Very poor service from the workshop and team.