Premium increases twice in a space of a month of R500 without my knowledge...

Discovery Insure has turned to be a nightmare. In February my premiums were increased with more than R200 and I kept quite while other insurers were decreasing premiums due to car value depriciating. Now in a space of a month my premiums increase again this time without my knowledge. I just woke up with a debit of more than R2000 in my account from them. I went from paying around R1500 to paying more than R2000 in a space of one month. When I call them I'm told the increase in February was for things like weather, has anyone heard of such madness and the increase now is the anniversary one. Who does that? On an old car that has depreciated in value drastically. Two weeks back I had called them to discuss adding my home contents and I was moving to the thier medical aid from May. I have other products with them as well. At this moment I'm canceling everything that has to do with Discovery. I want absolutely nothing to do with this company. They rob people of their hard earned money. This is the worst treatment I have ever received from insurance and I regret the day I moved to them. I will be canceling every product with them....