Vodacom Communication Failure

I have had an ongoing issue since February with Vodacom and received an invoice for over R10k for July. The problem is from February till June i was overcharged by over R700/month. They finally fetched their phone that they made a mistake with on 12 May and they have still not corrected the reversal of the contract upgrade. I have had to block all Debit orders with the bank at an additional cost out of pocket. No one gets back to you. Vodacom are a useless company full of lies and broken promises