My car break down, I have taken it to garage. estimate is given to me after 1 day for 850 pounds.
Again after 2 days, Garage owner told me that there is a fault in engine, and asking additional 700 pounds.
The cost of running car in market is not more than 1200 pounds.
I told that I don't want to repair the car and asked them to return my car so that I can declare it scrap.
Garage owner is not allowing me to take the car to declare it scrap, they are asking to pay the cost of parts and labour for the work they have already done on car which is around 700 pounds.

Please advice me what should I do