Fone Choice - Div of Home choice

I bought a laptop by them which was covered by their inhouse insurance, Ive send the laptop in June 2020 and was told I need to pay an access fee which I agreed to. They didn't take the fee as agreed at the end of July 2020, but kept phoning me to tell me I'm in arrears with my account which I said its impossible as their debit orders are set the day before I get paid. The took the fee end Aug 2020. I have bank statements to proof it. I received my laptop back at the end of Sept 2020 after numerous calls that I've made only to realise the same day I received it my laptop still had issues. They collected 2 days later and then again debited my account for the access fee which I queried and was told that wasnt supposed to happen, so I reversed the debit order. I only received my laptop back at the end of Feb 2021 which the same issue that I send it to them in the 1st place, they debited my account at the end of Feb and now again,(I've reversed it again). Ive asked why via email and phoned no one is getting back to me. Now I'm getting calls and saying that I owe them and they will charge me collection fees if I don't pay.