Bad customer service From Cell C

I have been a paying customer of Cell C for the last two (2) years. For the last three (3) months i have had to contact Cell C to debit my account as their debit orders are not going off my account. I have now reached my limit with their endless stories of why my account is not being debited on the 6th of each month. I keep phoning and i keep getting reference number which afterwards aren't even accurate as they can't pick them up. I have just gotten off the phone with Tembi and have been advised yet again that Lebo the manager will phone me. I don't get my hopes up after 3 months.