I bought a Mazda in December 2017. It had 10,000 miles on the clock and I paid £16,000. I was sold the car with the remainder of the 21-month manufacturer's warranty, so I had six months left on it. The salesman advised me that in order to keep the warranty valid, the next service was due in September 2018 or at 25,000 miles, whichever came first. I discovered last week that when the previous owner serviced the car, genuine Mazda parts had not been used. I queried it with the dealer where I bought the car, but he cannot tell me one way or another whether the car is still covered by the manufacturer's warranty. Is it the garage's responsibility to ensure that they have carried out the necessary checks on the validity of the warranty? Can I reject the car and ask for a refund because it wasn't sold to me as described?