GET IT TOGETHER PLZ

The battery was in good working condition when i first booked it in. So now they telling me that the battery is out of warranty. If there was a issue with the battery why didn't they advise this the first time the device was repaired and also it was not also the battery issue, the screen started fading when it was returned to me. I really need this issue solved as I am not getting any joy out of this. Is it because the first repair for the charging point was under warranty and I ddnt pay for it that they purposefully tempered with the device knowing that it would be booked back in with a qoutation that not even a fool would accept . <br>