Double the premium then don't respond correctly?

Received notice of a premium increase on 7 June, from +- R278 - R545, (almost double) from 1 July, which is not even a month's notice, so unacceptable. <br> I queried this on the same day, and heard nothing, I wrote again on 19 June, and finally received the following response on 22 June.<br> \Your premium is influenced by the likelihood of a claim and the expected amount of the claim. Factors that have an impact on the likelihood of a motor claim include: age