Bad service from a Turbo charger supplier

I bought two new turbos for my Discovery 4 from Steve at Turbonamix. I had the m fitted by another company. I paid him R25000.00. On start up somethin went wrong with the primary turbo. I had to pay another R10000 for a body lift to remove the turbo and send back for inspection. I had to pay another R4000 for repairs to the turbo. Since I received the car back it keeps going into limp mode - low boost pressure. Turbonamix, Steve, have many stories but the problem theirs. The actuator, which came with the new turbos seems to be the problem. According to Steve, no warranty on it, it is electronic. This will cost me in total another R6000 to have fixed. All costs, thanks to Turbonamix.Also now they reckon it is 'upgraded ' turbos. I never asked for upgraded turbos, I only wanted new turbos.