dnt signup

I app**** for a contract online someone called me I got the phone after 3 days I returned the phone RAM courier collected the phone that was early January 2019. I was debited in February and March 2019 which I reversed the debit order because I cant pay for something I didn't use and I dnt have. I need really need assists with this matter how can you take my money and now the collections departments harassing me everyday to pay up. I dnt even have a phone , because