Vodacom ripping clients off with excessive direct debits due to billing system errors.

Last Year when an upgrade to an existing Data Sim contract fell due I was offered and Upgrade to a larger Data Bundle for the same Fixed Monthly cost and on the same terms as my existing Data Bundle which when exhausted would require topping up. This worked well until suddenly around April I was debited with instead of the usual R 99 ex. VAT an amount in the region of R 2.5K. When I queried this and after much toing and frowing Vodacom agreed to pass a Credit for most of the amount but not all. Rather than fight about the difference I left it on the understanding that the contract had been fixed. Subsequently all went well again until August when once again I was debited for much more that the R99 ex. VAT Top Up data Bundle. Once again on querying it Vodacom has offered a partial Credit and I am not prepared to accept it this time around as they were supposed to have fixed the problem and I also have in writing this time the actual Quotation that I was sent as part of the process of fixing the problem back in May. Extremely poor service even though it was agreed in both cases that the original agreement was for a R 99 ex. VAT top up data bundle.