Return Cancelled

Hello, I have countless videos of the OnePlus 13 before I returned it and there is no damage or anything I could see. I returned it within the return window and they declined it? I want to fight this with my debit card company now but has anyone experienced this? They sent the 13 to me late, and the battery overheated out of the box which is not the biggest deal. I have no clue what to do besides just start the charge back process with my bank.