VODACOM BLACK LISTING ME

LAST WEEK I RECEIVED A CALL FROM SIDNEY, WHO INFORMED THAT I WAS HANDED OVER TO HIM WITH MY ACCOUNT WHICH SHOWS ON HIS SIDE THAT I HAVE NOT BEEN PAYING SINCE LAST YEAR. I THEN TOLD HIM THAT I HAD AN ARRANGEMENT MADE AND WAS PAYING R500 A MONTH AT THE GATEWAY BRANCH, USING MY CELL NUMBER AS A REFERENCE WHICH I WAS ADVISED TO DO SO OF ***. I THEN TOLD HIM I WILL TRY AND FIND THE SLIPS, I TRIED TO CALL HIM LAST WEEK TO TELL HIM I HAD TO RUSH TO JHB FOR A CONFERENCE, BUT I COULD NOT GET THROUGH HIM. TODAY I CALLED HIM, HE THEN ADVISED ME ARROGANTLY, THAT I NEED TO KNOW THAT I AM NOW BLACK LISTED AND I HAVE TO PAY R13000 AND I TEN TOLD HIM THAT WAS NOT THE AGREEMENT, I OWED R3500 WHICH BY NOW IM SURE I ONLY NEEDED TO PAY THE LAST R500 AND REISTATE MY CONTRACT AS PER AGREED. HOW CAN VODACOM DO THIS WITHOUT CONTACT ME? WHERE ARE THEY COMEING UP WITH R13 000 FROM? I DO NOT WANT TO BE ****** ON A DAY LIGHT. I MADE ARRANGEMENTS AND YOU AGREED TO THEM, NOW YOU ARE DEVIATING FROM THEM AND BLACK LISTING MY NAME??? WHY DO THAT????