Pathetic service

On-air TV Called me beginning of December 2020 selling DStv explora and Lte and i was interested and i ordered. in 3 days before they could deliver i called them requesting to cancel the order and i even e-mailed them but i never received any feedback, come the 25/12/2020 R179 debit went off. i called enquiring and i was told it is cancelled was given this ref ***8 and i e-mailed again requesting refund, there was no response but again they debited my account on the 25/01/2021. what must i do now to get this matter resolved? i want my money for 2 instalments reversed Asap. I regret doing business with you.