TELKOM continues to ignore my request for the to rectify my credit record.

I took out a data contract with telkom. It was R200 month for a year, i used it for about 6 months and tried to cancel because i was struggling with reception in my area but i was told i do not have a contract with telkom. now im being told im being blacklisted by telkom and that i owe R3200, thats more than the entire contract.