Wrong amount debited... Twice!!!

I'm m so not impressed with Iwyze for the first time being a client with them for 4 years!! Recently bought a new car and still have my old car insured with Iwyze. I have never claimed from my insurance since been with them. We agreed and as stated in my policy that for both cars I'll pay R2392.92 as a premium which I am happy with. On the 22nd on my debit order day they debited me R3376.93. I call them first thing on Monday to ask why, they checked and say they charged me twice for the one car. They said they would refund me the almost R1000 that they over charged me with which will come after 2 weeks. I said hell no to that and said I will reverse the amount with my bank then call them back to arrange a recollection for the correct amount which they said was fine because I wasn't going to wait 2 weeks for my money. I organized with them on Wednesday to do a recollection for the correct amount R2292.92 for Friday and guess what?? Receive and Sms today to say they are going to debit me R3376.93 AGAIN!!! This is just unacceptable!!!! If they do not fix this I am cancelling because this is my money and budget they messing with!!