Extremely poor customer service from Vodacom

I cannot begin to explain the level of incompetence shown by Vodacom.

After purchasing a phone and needing to perform a sim swap the issue is still not sorted. This is an issue that began in July. Vodacom has been billing us without issue but refuses to fix the problem and instead shifts the blame to istore. We have used every channel of communication possible but the issue persists. We have found out that the number still belongs to another customer and in this case we have been paying for somebody else's data/airtime. Should we not receive feedback regarding this by the end of this week, we shall be cancelling our entire family's service with Vodacom.