MTN South Africa Double Debited Me and They Have Not Refunded Me.

In May 2020 I was double debited on my account and i went to mtn east mall to find out what happened and i was told to call customer service. Which i did and was taken to pillar and post. Until in June 2020 I was told I my account will be credited back and was given a reference no to follow up within a week and i called again and was informed my query is still open. And in July same thing. In August i called again and was told same thing and given another reference no. To date i am still not refunded or my query being resolved. I am so angry and annoyed at the bad service MTN is giving. I am a loyal customer but now i just feel i need to shop somewhere else just waiting for my contract to end with them because the service is really poor.