On Air tv company, refusal to pay back my money

I bought a DSTV Explorer that comes with an internet connection in November 2025, and it was delivered in December 2025. But I found that the agreement I had with the salesperson was different from what was delivered to me, so I called them, informing them that I wanted to cancel, and I paid R400 for the return of the device, as they had requested me to do so. But they keep on debiting my account from December 2025 to January 2026. And we agreed that they will refund my money on the 14th of March 2026. I called them today again, but no one is giving a clear answer on what's going to happen with my refund.