When telkom puts you through hell

I have been a client at telkom for over half a decade. Recently they've started taking half the amount when they debit from my bank account for reasons unknown to me. Only to send me texts 2 weeks later informing me to pay the outstanding amount, and locking my phone numbers.

And they've the nerve to tell me that it will take another 7-14 working days for the funds to reflect on their system.

This is quickly becoming a nightmare as it is costing me valuable business.