CONTRACT EXPIRED AND THEY BILL ME 3 TIMES MORE

MY CONTRACT EXPIRED AND I JUST RECEIVED AN SMS THAT ME NEW DEBIT ORDER WILL BE 3 TIMES MORE THEN I PAID AT THE BEGINNING...IT LOOKS LIKE I AM NOW PAYING FOR MY PHONE AND ALL SORTS OF ADD ON PRODUCT WHICH I DID NOT AGREED UPON...I HAVE BEEN ON THE LINE WITH THE CALL CENTRE AFTER I SPOKE TO AN AGENT FOR MORE THEN 20 MIN NOW WAITING FOR THE MANAGER. THEY SAY THEY NEED TO LOG A CALL NOW AND IT TAKES 73 HOURS BEFORE IT IS ALLOCATED TO SOMEONE...MY DEBIT ORDER IS GOING OFF ON THE 25TH...IT IS NOT GOING TO BE IN TIME FOR THE COLLECTION. THEY ARE SAYING NOW THAT THEIR SYSTEM DOESN'T WORK AND THEY CAN'T ACCOMODATE THE EXPIRED CONTRACTS...THIS IS REALLY POOOOOOR SERVICE AND I AM SO FURIOUS AT THIS STAGE...AND THE BILLING RUN IS ALREADY DONE....