Vodacom - I***. Flagging me on ITC for a R 5.00 short payment 3 months ago!!

Account number - I***. I accidently short paid them 3 months ago by R 5.00 on my contract. I suddenly get a flagging notice from ITC stating that I have not paid them for the November invoice. Upon further investigation and numerous phone calls and emails, I was told I short paid them by R 5.00, 3 months ago. Surely they could have contacted me or added the shortfall on the next month's invoice? They flagged me as non payment, which is not correct. They have now caused my credit rating to take a serious dip in point because of R 5.00!! My account is around R 2500 to R3000 a month. I find it utterly disappointing and ludicrous in the way they have treated me. I asked their consultant how she would have felt if she was in the same situation, she fully agreed that she would have been unhappy as well. These big corporate companies think they are above the law when playing with the normal man on the street's credit records. I will be porting to MTN, that is for sure. It is impossible to get hold of a human being in their legal department to sort out the matter. I paid them the R 5.00 I owed immediately when they notified me on the 9th of November. Their email - *** forwards all queries to a MOBI bot. The bot does not recognize my query either.