Double debit!

My vitality debit order bounced last month (end of April 2022). This is due to unaffordability. It showed the outstanding amount and I assumed I could not use the benefits for the month of May. Now you guys double debited my account (almost R800) which I certainly did not approve for those funds to go out my account! I am now almost R800 short to pay rent and this is totally unacceptable! I called this morning to cancel my vitality and the call centre agent said she doubts I will get a refund! I would like a refund of the last two months as soon as possible! Someone needs to show me where I authorised for almost R800 to come out of my account! Not ok!!!!