Cancellation not processed

I Requested a premature cancellation with the retention department of Vodacom and a quote was sent to me to make payment in order for my contract to be cancelled. I sent this quote with proof of payment back to the relevant department as indicated on the quote. Till today nothing has been done and they are still deducting without authorisation. This is poor customer service and I never expect this from Vodacom. This needs to be sorted now and if it doesn't this will be all on social media and Will take further action with my lawyer's.