bad service

from last year have been trying to cancel my two contract then on then i was told to pay R13046 for the phones to be cancelled and that they have fixed my bill,on the 25 of Feb i paid R13046 that they requested for plus R469 for the phones that are still only contract,01 March both the numbers were successfully cancelled of which in my understanding after i have made the payment am not in arreas but i keep on getting sms saying am deforting to pa the amount of R1500 i call them and i was gevin a case no ***2 but still no one has call me.