Opel SA

Last year July I bought a brand new Opel Corsa 1.0t Essentia. This year January the engine light came on and the turbo would stop working, I took my car to Williams Hunt Centurion, they reset the error and sent me on my way, the next day same problem. They reset the error once again. Next day, same. They booked the vehicle in to have it inspected, after which they came to the conclusion that it was the computer that was at fault. They replaced the computer as well as the turbo, all under warranty. About 2 weeks later I noticed a noise coming from the engine, and decided to check the oil level, bone dry, I contacted Williams Hunt and they informed me to use Multigrade oil, which I then did, I took it back to them to inspect. Since then my car is using oil like MAD. In October the engine light came on AGAIN, I took the car to Williams Hunt Edenvale, they inspected the vehicle and replaced the turbo, again. I took my car back there yesterday (18/12/2018) for the same problem, first they said that there was nothing wrong, no engine light, no errors... Today they said that it looks like there's something wrong with the motor, as there's lots of smoke inside the engine while it's running. NOW they reckon that is why the car uses more oil than normal. I am going on leave tomorrow, and Opel cannot confirm whether I will have a courtesy car by then. This is my 3rd Opel which I've owned, and the 6th Opel we've had in the family, sadly enough I am SERIOUSLY over OPEL, NEVER AGAIN will I buy an Opel. Yes, everything gets fixed under warranty every time, but when the warranty runs out, this is going to be MY problem!?