Disgusted service even though I tldont have business with DSTV

HAD A CONTRACT WITH DSTV FOR A VERY LONG TIME EVENTUALLY CANCELLED MY CONTRACT DUE TO THEM CHARING ME FOR A DECODER I WASNT USING. FEW MO THA LATWE GOT A SMS FROM DEBT COLLECTOR SAYING DATV HANSED ME.OVER AND I OWE THEM MONEY. I AM STILL WAITING ON SOMEONE TO GET BACK TO ME WITH REGARDS TO MY REFUND...AND THEY Have the audacity to phone me to ask if I want to do upgrade clearly thiwr records not updated just shows how oncompetent they are