Homechoice ****s

I ordered neevah blankets from Homechoice about 3 months ago online and my order was cancelled, so a sales agent and help order again, so I received the neevah blankets a couple of weeks later and got in contact with Homechoice and told them to cancel the order that the agent had made but they didn’t, so on the 25th of June 2020 a double debit order went through, they debuted money from my account for blankets that I didn’t even even receive. Please help me because I reversed the transaction and they put my account into arrears yet they haven’t fixed the error on they’re side, now they’re also messing up with my credit score. Please help...