incorrect debit order date unpaid debit order fees

On the 24th of April my acc gets debited for my monthly subs be it as it may this is not my debit date so as I get pd on the 25th of each month wether its on a satday I will get pd irrespective. So doing the responsiblle thing I ph telkom the 25 April to enquire why would u debit my acc if I have not gotn paid yet and that's where things went all downhill. I get told I need to make a transfer to pay the unpaid amt to which I point blank refused as I didn't instruct telkom to debit on that date nor did they communicate to say they will debit on that date. Low and behold on the 27th I get a sms stating dear subscriber our records indicate your acc is unpaid wit *** to which I immediately contacted them and asked them how is them debiting my acc on the wrong date before I even get paid my problem after a whole to and fro I asked them debit my acc now as I got pd on the 25th and they couldn again askn me to do a transfer to which I said no again. I was given a ref # again and said 72 hrs i.e 9 workn days its the 12th no feedback not even a call to say sir we are still tending to your query etc... Now how responsible is that for a service provider ?????