Appalling customer service from Vumatel

On 23 February 2023, I paid R529 to Vumatel to come and install a fibre which I made on order of a week ago but only paid on the 23rd. On the 24th, they came and left without installing anything citing frivolous reasons about some box they cannot find. I followed up with them a following week and I had to cancel the whole deal. On 29 February, through their WhatsApp, I asked for cancellation and they promised a refund. To date I have not received my R529.

Today, I called them to follow up and they said I should query on WhatsApp. What kind of a company cannot take billing enquiries on a phone? They just say we must chat on WhatsApp.