Refund for non service delivery

I am very disappointed with Vumatel service, in August 2023, I paid for fiber installation which did not materialised due to misrepresentation of their call center agent. Since I requested refund in October 2023 till today, nothing is happening, no communication from them. The only communication I received was on the 25th April 2024 in which I was querying about my refund and I was told that my ticket is with their accounts department, today is the 21st of June 2024 with no refund or any communication some sorts. How long does it takes for one or business to refund R399.00? I think I am taken for a ride with this people.