SELLING DAMAGED CARS

On the 24th April 2016 I bought car at Hyundai Grand I10, a brand new car, a week later the radio broke, while we were surprised about the Radio the speakers on the left hand side of car also broke. They replaced the radio but they refuse to fix the speakers they are blaming me for the damage. today is the 22/09/2017 my speakers are still dead. will never buy from Hyundai again, their after sales service is very poor.