CELL C BILLING BOTH BANKS AND WHO GETS THE CHARGES!!!

I AM SO UNHAPPY WITH CELL C, FOR 10 - 15 YEARS I HAVE BEEN A CLIENT WITH CELL C AND NOW, AFTER CHANGING MY BANKING DETAILS IN TIME, THEY TAKE INSTALLMENTS FROM THE ACCOUNT THAT IS CLOSED, BANK CHARGES IS LOADED BECAUSE THERE IS NO MONEY IN THAT ACCOUNT, I AM GETTING DEBITED ON THE NEW ACCOUNT, BUT STILL THEY DEBIT MY FNB ACCOUNT, PHONING ME AT WORK IS NOT MY CUP OF TEA. PHONE ME AFTER 16H00 WHEN THERE IS NO PATIENTS OR PEOPLE AND I HAVE TIME TO SPEAK TO YOU. STILL THIS MONTH, DEDUCTION IS MAKE OF THE FNB AND COSTS IS ADDED AND DEDUCTION IS DONE ON THE NEW ACCOUNT SO WHY DO I HAVE TO PAY TWICE!!!. IF YOU PHONE ME TRY TO RESOLVE THE PROBLEM, NOT TRY TO BE RUDE!!. REALLY CELL C, PLEASE RECTIFY THIS OR ELSE I WILL REPORT THIS ON THE BUSSINESS LAW AS WELL.