Beware of king price. Not true to their word.

I bought a new car last week. Read all my claims from my previous insurer to them. I took out the policy because their price was the best 3 days later they phone me and told me my premium is going up by almost R200. How can a company claim to be so good but can not even stay true to their word for less than a week. My advise to anyone would not be to trust what they sell you. They are incapable of doing a propper quote.