Cars R Us review: Refusal to make repair

on june 2nd, i purchased a 2017 qx30 infiniti..beautiful car..also, talked into a warrenty..immediately the yellow check engine light came on..i was told the problem was the car needed premium fuel..which of course was not true..took it to a menchanic,to check out..needed brakes and 2 tires..had cars r us do the work,,i asked about the check engine light..was told you have a warrenty take it to an infiniti dealer...warrenty was useless..however had them do the scan for 235.00 the found 8835.57 would be total to repair..the car cost 11000.00..rodents chewed wires..to say the least..took the car back 6 times in 2 weeks..their mechanic refused to do the work..please help