Very unhappy customer

I was delivered a laptop and router that I didn't not request, in April 2021. The next day I returned the device to the Pavillion store. I was then debited monthly for several months for this device. Upon my query with Mondo (MTN's) call center, I was charged cancelation fees. I refuse to pay this as I did not request for this contract and I didn't have the device in my possession. This matter was resolved after a few months. However the monthly debit order chargers have not been refunded to me, to date. I have canceled my sim contract, I have paid to cancel my contract. This money is sitting in my account but MTN is not paying it into my bank account. This has been going on for more than a year now. I have been to the store multiple times with no joy. This is a substantial amount and I really need help.