Paid but suspension of service, why?

I am using telkom contract phone, they debited on 1st of Dec then on the 3rd today they suspended my services because the money is not reflected on their side but they confirmed the receipt by collection office. who’s fault is that?

I didn’t pay, they call every minutes but if the fault is from their side they tell you about 48 hours and you keep on begging, they keep you waiting on the line until you got asleep.

I am not happy today because of what happened today