Homechoice harrassing people

I ordered a bedding set. Arrived quickly no problem, I then put it away in the closet since we are painting our walls. Finished painting the walls, took the bedding set out and struggled, not the right fit. I checked the packaging and then saw its Double and not Queen. I phoned and mailed Homechoice explaining the issue and was informed sorry you are over your 14 days return policy. This was day 16. Okay so I made a mistake by trying to protect the bedding set and not checking the size. No its just in the closet in packaging lying there no usage. I accepted my mistake and paying for it . Homechoice first phoned me and said ok a manager will call to sort this issue. Sorry nothing !But now Homechoice is harrassing me on a monthly basis about when will I pay my account. My account is up to date. I pay each and every month. I even requested that they should stop phoning me. If my account was in arrears this would not be an issue. So why keep harrassing me?