Mercedes-Benz of Walnut Creek

I purchased a used car putting down more than 10k and a week later the engine lite came on took it back and according to them they didn’t know why which was hard to believe when you hook these cars up to a computer and it gives you a code to say what’s wrong anywho since then I noticed the car had no backseat headrest (19k car) had to reach back out to Omar in which he just stopped responding so I pulled up and he admitted to selling it this way same day I drive to school and the check engine light comes back on I notify Omar this isn’t good he says bring it back I tell him I have school and appts this week are they going to provide transportation he basically said no but he would check and get back to me which he hasn’t I will be going back again had I known this purchase would have gone like this I would have went else where you think of Benz and you think quality but this experience has been just the opposite. Oh and did I mention when they had the truck the first time they kept it for 3 days and someone drove all my gas out tank literally went from full to just above the E just horrible