Cell C Debits Twice and Denies it.

Cell c debited my account on the 30th of November as per my debit date. but on the 1st of December it did the same thing and i called them to inquiry about the transaction and i was told to wait 48 hours as their system takes that time to update. and i must email y statement as proof. i did as told. three days later i do a follow up i am told no cell c only took one debit. i send proof of payment to an email that doesn't go through and i then email customer service and call them back and forth. on the 7th of December i get an sms telling me that my account is in arrears i did not pay for the month of November. i do the same process of sending them the proof and they say the did not get the money and i kindly ask why do i see a successful debit from cell c in black and white. and i was told to contact my back and bank confirms the money was successfully debited form my account. Cell c is giving *** service and trying to blame customers and they must fix their systems because the same issue , was done to my husband for the double debit. If you guys have poor strategy of generating revenue from your CONTRACT BUYOUT do not ***** people's money that are good to you.