Its Aldermere Garage in Stourbridge.

I wonder if someone can help me. My car has been in the garage since April 2016. I have been given all different dates when it will be ready. I have whatsapp messages to say it would be ready in February this year. Let me explain because I really need to understand what my legal right is as I though garages had to carry out repair within a reasonable period of time. In April last year my BMW 325i broke down. I was told it was the head block. At first I tried with no success to find a head block and then decided to opt for a part worn engine. I ordered the engine but unfortunately they sent the wrong one which caused delays. However a head block became available in August 2017. Since this time I was told that they had to await pistons. I threatened to take the car back in February but was told that I would need to pay for the work that had already been carried out and they have ridiculous excuses. I have left my car with them but up to today my car is still not ready, they have caused extensive dents in the car which they said they would repair. However it has been well over a year and I am still without my car. Can anyone tell me what my legal position is. I have already paid them £500 up front. Mark