Telkom Contract dissapointments

Greetings As a frustrated Telkom customer, the service delivery from their accounts and billing department can be dissapointing, I have been debited on over R4.4k in 30days and my account has been locked. When I call in there seems to be absolutely nothing their consultants can do as they say it doesn't appear on their system, I've got bank statements to prove this. Can anyone share advise please?