3 Months # cars all of then engine needs to be replaced!!!!!!!!!!!!!!!!!!

I've been struggling since October last year and no assistance from Opel, The call center staff is extremely rude, I bough an Opel mokka when it got here the headgasscet was blown, then i bought another one , same issue engine needed to be replaced, then i bought a 3rd one engine needs to be replaced, three cars in three months all off them mayor engine issues , So all i wanted from Opel SA was to assist me with a car for the same price same model not even brand new, just to help me buy a vehicle but they dont care, I've been paying every month for a car that I dont have, My credit score is up to **** as its been 3 cars in three months so i went from 9% to 15 struggling to get it down, and its not my fault . Buying a new car is supposed to be exciting and its been a nightmare for me and im still without a car. I did not ask for money or anything just assistance since its seems the brand is selling the the worst cars and not inspecting them properly, I cant blame a dealership as i used 3 different ones and all the same issue, now i need to downgrade to a manual when i baught an auto since my interest rate is so horrible i cant afford anything else. Never have i ever experienced such rudeness and no care from any company