On Air **** me out

I had a contract with on air which were suppose to last two years. It had two explora declrderd for R199 each. My contract ended in April 2021 from that date I stopped to pay because the agreement was that I must pay 24 months. The sales team phoned me and asked if I want to upgrade I said no. I phoned the office to cancel the account. Every month a new amount is send to me and my name has been added to the credit bureau for non payment