Telkom non response to query

On Friday 10 April I wanted to buy Telkom mobile data online during this lockdown. I got onto telkom.co.za and while searching came upon a site called "Just Answer" and I gave my card number thinking that it was part of the registering process. R506 was deducted immedintelligent and nothing more came from that site even though I pleaded with them ton refund. On Friday 17 April a further R510 was deducted without any service or help rendered. Please advice as to how I can stop this.