DStv MultiChoice ******** for money

I have not been using DStv for 3 years now and out of the blue someone contacts me and says that I owe them money because I did not let them know that I am not using the DStv anymore, although I have paid tis on a month-to-month basis and your account is automatically stopped after this. They refuse to send me an invoice and wants me to pay them immediately.

This has happened to a lot of my friends, families and colleagues. I have never in my life had such bad service.