Bought used car from dealer has issues

[s3cure]

I bought a used Ford Galaxy from a general used cars dealer in Chigwell as a part exchange and paid with debit card. While driving the car back home I discovered that the heating in the car doesn't work. I also discovered 2 days later that the engine overheats and that I couldn't lock the car and also it kept loosing power as if the turbo function was switched on and off. I took it to the mechanic who suggested that the water pump and possibly thermostat may need replacing and the remote locking and immobiliser is further work. So I rang the dealer and complained that I have these issues who initially tried to put me off but I called too many times and he eventually said we will fix it for you. So I drove the car all the way back to the dealer who then sent me to another place for fixing it. I spend the whole of that day (taking day off work) but the guys couldn't fix the heater and advised me to leave the car and they gave me my car back which I had part-exchanged with them to drive away until the new car is fixed. Its been nearly 3 weeks and I have ranged god knows how many times and the car is still not fixed. I asked for a refund but they refused to say that they are repairing the car for me. Where do I stand legally with this and what should I do. I am really stressed... many thanks for any help/advice.

[CleverClogs]

Re: Bought used car from dealer has issues

Get on to Trading Standards and/or VOSA, as they may previously had concerns about the motor cars sold by those spivs.