ridiculous premiums debited willy nilly

I bought a car on the 23 of November this year and asked the dealership to organise an insurance for me as, little did know that I will be a cash *** to this guys. they quoted me for R1600 on 2011 mini which I dint have a problem with, my problems started with their debited amounts, I was told they will deduct a prorata and was surprised to see a debit order of R1866 and two small amounts for the excess and the platinum insurance for R211 each, which I then later cancelled the (plat insurance). as I was expecting to see the monthly debit order of R1497 on the 21 of December I was again hit by another surprise when they deducted the so called dotsure fee of R950 and the excess fee of R211 which i agreed on. my worry is that in a period of less than 30 days I paid almost R5000 which is almost double amount I'm paying for the car. people should play very very far from this insurance Co if they really value their hard earned money. I'm asking myself how much will I pay in January as these guys are doing as they please with my bank account.