American Battery Rustenburg

We have bought a battery on the 3rd of June 2022 in Rustenburg, American Bettery. On the 1st of September the car did not want to start. So we took the battery back to them to findout what is wrong. They told us we have sound in the car and a tracker so that drained the battery, and the battery is to small for the car. But they have gave us a bigger battery as what we had in before. And now it still the wrong size. So they have charged it and said we must come and collect the battery the following day. We sent our father because he drives with the car. He took the car back to them with the battery and sound in. And they start testing the battery again and test everything on the car for if something is draining the battery and there was nothing. And the wrote on the back of the slip ( Batt toets 13.1 alternator is reg 99% kaans iets was aan gelos hul het musiek gespeel) but we live in a complex that the rules state you may not listen to hard music or music in your car. So why would we do it.