CELL C NOT CHANGING BANKING DETAIL - COSTS ARISES AND ACCOUNT NOT PAID

FOR YEARS I AM A LOYAL PAYABLE CUSTOMER AT CELL C. I CHANGE BANKING DETAILS AND THEY KEEP ON DEDUCTING ON THE OLD BANK AND ON THE NEW BANKING DETAILS, I GET CHARGES OF R130 PER DEBIT ORDER NOT GOING THROUGH AND THEY DONT CHARGE ONLY ONCE, THEY DO IF 2 OR 3 TIMES AND EVERY TIME THERE IS R130 CHARGED TO MY OLD BANKING ACCOUNT THAT WHO WILL MAKE PAYMENT???? I URGE THAT CELL C PAY THIS TO FNB AND WILL NOT CHARGE ME MORE THAN INSTALMENT RATE FOR A MESS THEY DID, NOT ME!!!! I AM SO UPSET, I CANNOT TAKE CALL IN DAY TIME UNTILL AFTER 16H30, THE PHONE ME ON MY WORK NUMBER, AFTER SAYING PLEASE PHONE ME AFTHER 16H00 THE WILL PHONE THE NEXT DAY ALSO ON MY LAND LINE, WHAT SERVICE IS THIS, CAN YOU CALL IT SERVICE, WHY BEING SO UNPROFESSIONAL FOR A COMPANY SO BIG??? SOME ONE DID NOT DO THERE JOB, WHEN SPEAKING TO THE CUSTOMER CARE PERSON, THE PHONE GETS DROPPED BECAUSE THEY SAY MY ACCOUNT DETAILS HAS NOT BEEN CHANGED AND I AM LIABLE AND MY ACCOUNT IS IN ARREARS??? WHY....WHO IS THE GUILTY PARTY , WHO WILL PAY THE COSTS!!! CELL C IS SO DISSAPPOINTING AFTER SO MANY YEARS!!!