BILLING ME FOR A DEVICE I DONT HAVE FOR MONTH

i am a telkom customer, i have had endless problems with a tablet i have purchased and then returned, i was told that i would not be paying a penalty fee, returned device around february 2015 and now when i recieved my statement it shows i have an amount of R3039.00 to pay or else they will disconnect my service within 48 hours i have had it with this **** as i was told by the manager that there would be no penalty charges and NOW THIS<br> someone help me as i am paying my existing contracts full and up to date making payments i cannot pay this R3039 and now am in ITC because of this