Discovery’s vitality refusing to terminate membership

I was joining virgin active and simultaneously joining discovery’s vitality so that I can get the benefits from both parties. Discovery’s Vitality claimed to have activated my membership on the 30th of August and that I was eligible for all benefits immediately. Virgin active said otherwise. Realising that I was being ****med by both companies I requested that vitality cancel my membership within 7 days of activation, however they refused. I made these requests via email and calls and still they are refusing. I don’t need their useless ****ming benefits, all I need is immediate cancellation of their stupid services. Why must I continue paying for services I made it clear I don’t ****en need.