Opel, worst car brand 2017/8

My car's engine light has been switching on regularly since November 2017 and has been to WH The Glen for almost all such incidents but one and every time they claim to have changed a certain part on the engine or car. The car was there about 2 weeks and on Thursday 10.05.2018 I was told the car is ready for collection, all is fixed and the car tested. On Tuesday the 15.05.2018 while driving home, car switched off mid traffic and when I start it again, there is the engine light ON AGAIN. I let Jethro Price and Laura know whats happening and initially Laura responds and talks about trading in the car and I'm like I don't have money for that. Next day I ask her whats going to happen with the car & silence. She & Jethro start ignoring me. At the insitence of GMSA's Themba working on my case I take the car back to WH The Glen. I speak to another service consultant and she checks for a job card using the tag still on the key & says nothing shows here. Nothing was actually done on the car, I just said to her I'm not surprised. Then Jethro shows up & invites me into his office only to spin me a *** story about there is nothing they can do and that they can only change whatever comes up during diagnosis, no apology NOTHING. Buying an Opel is definitely the worst decision so far. Opel has blocked my comments on their FB page since I started posting about comments about my issue.