Bought a car cash in December, got home and the car had a heat problem

Bought a car cash in December, got home and the car had a heat problem. Had to go up an down to we buy cars for assistance, in January they said we must get a quote and it took another 2week for them to approve. The car is finally fixed but when we bought the car the licence disc expired in September and this week we register the vehicle and we had to oay all the penalties. No one answer any queries😡