Telkom is a *****

I thought Telkom mobile was good till I had an unforseen circumstance and I missed last month's payment. This month I have made 3 payments but they say I still owe them. I explained till I lost my breath to the consultant that I have paid the missed payment with it's charges, they still debited my account twice. To my surprise I still owe them and their consultants can't explain why I still owe after making double payments for December. How can their system be that slow that I chooses to update 1 of the 3 payments made on the same day, beats me. Hearing from other Telkom customers that it's how they operate, disappoints me.