Repair work not done properly

I bought a car at Autoglen on the 28 September 2017 at Autoglen BMW, a month later the was a problem with the car I took it in to Autoglen service workshop since it had a motorplan, the car was there for 8 days and they didn't even bother to organise me a car. In November I had a problem with the car because I could smell oil from the front and I had a problem with my car radio which was not playing, I had informed them of this problem but it was not resolved. I booked my car in the radio again on the 29 November for the radio and they took two days to repair and reprogram the radio. A month later I have the same problem and when I called the consultant seems so relaxed I had to drive around during festive with no music, the earliest date I was given is 27 December. My motorplan is expiring now end of December and this reoccurring problem that was supposed to have been fixed will be an issue after the motorplan has expired. Autoglen needs to give me a guarantee on their work because after this issue how can I trust them. I’m extremely disappointed with the service.