Worse bill by far

I made a payment of R355 towards my account at Telkom they told me it does not reflect and asked me to email a proof of payment which I did but telkom still went into my account debited me amount of R894.44 and went on handed me over to collection company while I made a payment in time.Every time I call them they tell me to wait for 48hours but now is 2weeks since waiting every time I speak to agent Im asked to send a proof of payment but my query does not get resolved what else I have to do to get help.worse customer service I have ever experienced in my life and my account is not in errors.