Imperial Alberton after sale BAD SERVICE AND NISSAN NISH ALBERTON

Bought a car in September 2020 from imperial. Took it to Nissan for annual service in Dec. A week after car started showing error messages on the screen. Took it back I was told battery was faulty had to pay 2300 for a battery. Old battery was at 70%. Which I was told the new battery was going to be expensive if they did not add the credit battery for the new one.

Still did not get the invoice that showed how much they were credited for the battery. Second why was a battery changed at 70% and who must repay me. Imperial Alberton is not taking responsibility that the battery was faulty when I got the car. They are saying Nissan service should have not changed the battery