Not taking care of their costomers

I bought a brand new Volvo V40 T5 R-design last year in November from Volvo Hatfield. Car was brilliant through out. Then it was due for its 1st service in August this year. Took it in & collected the following day. To my surprise my air conditioner, DVD/CD player and cigarette lighter where now not working. Went back to report. Car taken in and apparently fixed. Collected a day later and still problems where there. Went back 2 to 3 times after that and was told a new DVD/CD player was ordered but will take almost 2 weeks to arrive. That was in October. I was never contacted in this respect. I Decided to call them last month and they said they were just about to call me as my DVD/CD player was delivered. I asked how long are they gonna take to install as I will need transport to get to work. I was told they don't have a car for me use while working on mine. Decided to take some few days off work this month just to get this mess sorted out. Went there today to drop the car off but no one knew about the new DVD player. 4 months later I still dont have direction thus decided to leave the car there. I feel ill treated & undermined as a customer by a brand I trusted and loved.