Overcharged Debit Order

The named consultant convinced me to sign up at the club even when I was clear that I did not have the needed 1,300 rands for initial membership fee as a Vitality Member. He in fact came to my house and advised that I could join at a fee of 100 rands to have access to the club, and at the monthend I would then call him to pay the 1300. He made no mention of a 720 or so rands fee that would come out of my account. I signed up on 13th June and to my surprise around the 25th Virgin Active took out 720 rand from my account. At the month end, as agreed I went to pay the 1300, which I did, but the consultant was on leave and no one could help me reverse the debit order. I called the manager, who said that the consultant would come back to me but he didn't. It's almost 3 weeks, I still haven't heard from them. If I was informed of such an amount coming out, despite me being liable for a 1300 fee, I would not have signed up.