DO NOT WANT TO CANCELL THE CONTRACT

I HAD A CONTRACT WITH TELKOM FOR 2 CELLPHONES, FINISHED PAYING IT OFF IN MARCH THIS YEAR AND I KINDLY ASKED THEM TO CANCEL THE CONTRACT AS I DO NOT WANT TO CONTINUE WITH IT.WHEN I GO TO THE BRANCH THEY SAID THAT THEY DO NOT DO THE CANCELATION .GAVE ME THEIR USELESS RETENTIONS DEPARTMENT WHERE THE ADVISORS DO NOT EVEN ASNWER THE PHONE .EVENTUALLY ONE OF THE DAYS THEY DECIDED TO ANSWER AND I ASKED FOR THE CONTRACT TO BE CANCELLED BUT TILL THIS DAY THE CONTRACT IS STILL ACTIVE. NOW THAT I REVERSED THE PREMIUM YESTERDAY, THEY THREATEN WITH LISTING ME TO THE CREDIT BUREAU. STOP BULL****ING ME, I WORK HARD TO KEEP MY CREDIT ON POINT AND STOP FORCING ME TO STAY ON CONTRACT THAT I DO NOT WANT