False debit order

Dotsure had offered me a quote for car insurance which I agreed on, gave in my banking details and all. However a few days after, I had resigned at work and I called them to tell them I wont be having an income so I want to cancel. The consultant said to me rather than cancelling, they can freeze the debit order for 2 months then after those months they will get back to me or I contact them to let them know if I was able to get a job or an income. I checked my statement and I see that Dotsure had debited R950 off of my account. This is way more than the premium that we agreed upon. I am trying to contact my bank to reverse the debit order and I feel that it is totally unfair for me to incur those bank charges whereby I had made an arrangement with them and God knows where they got that amount. I am really angry, this is the second Hello Peter complaint about Dotsure. I want nothing to do with them.