Cheated by the dealer with faulty product.

I trade-in my brand new car of two months old to a Pre-owned Mazda 5 from this dealer in August 2014, and after few months in December, i took the car back because a funny noise from the back which then solved after 3 days and recently i took the same vehicle for a funny noise from the left side, after 1h, the service call me to tell me it was a ball joint which was faulty and needed to be replaced under the warranty, then after replacing the ball joint , they brought in another story where the gear box needs to be changed and i should pay for a clutch though on the mileage it indicates I barely used the car as the mileage since collection of the car is at 2578Kms and therefore, the clutch been attached to the gear box it should their responsibility not mine as the car is still under full warranty and the problem is not me but the product that was given to me. still no success as they want me to pay for that part and there is no way that they will consider that been their responsibility. I am very ****ed-off as the sale person on their office does not care about my email with very important notice, the main dealer is unable to assist, so i have request cancellation of services.