Cancelation complaint

I called in for retention and canceled before the device was sent through, to my surprise 3 days later the device was delivered at the branch by RAM and I was called by branch staff to come collect, I advised I'd canceled and he requested I call the customer care, called customer care and they said I should meet with the store manager at the branch to arrange courier and so I did and the store manager advised she'll send it back and if she encounters problems she'll call. A week later I receive a statement stating I'd be billed and there's a handset being charged which was firstly not delivered to the correct address however it was signed for me called customer service and no one seems to me know what's going on and I've requested countless escalations and it seems to be not a priority that I'm dissatisfied with their service for one. I've been reversing the debit orders and this makes me seen like a bad payer on my credit score... I have NEVER received such bad service and DO NOT RECOMMEND CELL C