Groupon Service Deal

In June 2015 i took my car for a service, as i normally pick up good deals on Groupon. Because im driving a Golf 5 GTI , i had to pay in for the synthetic oil and platinum spark plugs. My car broke down last week. I just came from Motorsport. They opened my engin to check what caused the problem. No oil, spark plugs was not changed oil filter is black -finished and this caused the issue with the fuel pump. I will not take this matter litely because i paid Auto GP in Selby for this and they a bunch of con artist. That could not do what they were paid for. I sat at their premisis since 9am the morning until 4:35pm waiting . God alone knows what they did. This is really disgusting. I have to replace everything again , why the hell do they advertise **** if they sit and con ppl.