Bad telephone service

I had an account where I took bedding linen, and when I paid it up, a lady contacted me to offer me other products because I had embarked on a debt free journey so I asked that the account be closed as I had paid it up. The lady who called hung up on me, I searched for their contact and to futile attempts I couldn't go through, they again called with an offer which I declined and asked again that they close my account which I take they never because I recently received an sms saying I owe them.