Billed for Vitality which I did not consent to

I was billed for 350 for Vitality which I did not sign up for- I called Discovery on the 30th of January to query this and I was told that they will lodge a complaint and investigate this further and revert back to me. I followed up last week as the turnaround time for a complaint as lapsed and spoke to a gentleman who promised to send me a call recording of the sale and to date I have not received it . This is not how you treat customers I need the call recording as proof or my money back