Vodacom dysfunctional

Have been struggling to get vodacom to deal with account bungles for well over a year. Started with them not removing the old device charge. Took 10 months to sort that out and they then started double charging the new device amount. After numerous visits ref no. s and promises they credited 4months deductions of the wrong contract (there were 5 on my acc). Have continued to pay the amounts. I know to be due but the last deposit does not appear on my account. Am now pestered daily to pay full balance of contract and have been cut off. Visits to at least 5 Vodashops, emails to addresses they have given me all of no avail. As an 80 year old ex teacher I recognise the work of the 30 percenters emerging from the dysfunctional education system. Can't take it any more and will now have to cancel debit order. Vodacom is as dysfunctional as the government-same resentful mentality.