Incorrect charges & Inability to understand query

I called 140 to enquire re a discrepancy in July and August accounts (after prorata for upgrade). It took me about 30 minutes to accept that the operator had no clue what I was asking despite explaining the situation about 15 times. He kept saying \Ok now I understand"but he still did not and did not listen to the numbers and dates I was querying so I asked for the accounts department. He told me to dial 145 and again I got through to an operator that didn't seem to really understand what I was asking. It's simple... I upgraded on 27 June and was charged a prorata amount for 27 June to 30 June on my JULY invoice. THEN on the same JULY invoice I was charged for the full month of July (1st to 31st) an amount of R60.53. But on my AUGUST invoice however for the same number of days (1st to 31st) and for the same contract"