Poor customer service- Not interested in the customer

I signed up to Vumatel via Webafrica on 30 April 2020, on the last day of their free 2 month promotion. I signed up and paid at the same time. On 1June 2020 my credit card was debited for R341.07. I called their billing department to log a query explaining that I had signed up during the promotion period. I was told that they would follow up as there some other clients who had experienced the same thing, so they would need to inform us what is the way forward. I received an email on 9 June2020 asking for my banking details so that they could process the refund. On the 23 June I called the call center again as I had not received my refund. My banking details were once again captured by the agent and I was informed the amount should reflect in 5- 7 working days. Today is the 30 June 2020 and I am yet to receive my refund. Why run a promotion under the guise of it being free, when you know you will be underhanded and still debit clients' account. I am tired of even calling because you call and they make you wait for close to 30 minutes ( I have waited for 50 minutes until my call was automatically disconnected)just to speak to an agent.