Vodacom does not keep their promises

Prior to emigrating I called Vodacom (28 Nov)and gave them a 30 days notice on my contract. I was given confirmation that my contract would be cancelled and that my last payment would be done. However at the end of Dev 2020, another deduction took place. I emailed Vodacom and they called me on my new International number to confirm the issue. On 5 January Dinah Maqula emailed me an apology and advised that I would be credited. Today is 20 January and no refund has been processed.

Since the 5th I have sent numerous follow up emails but have had not courtesy of a response??? How am I supposed to sort this out from abroad? This service is atrocious.