Absurd Rerate after nearly 4 claim free years

I took an outsurance building insurance in April 2017 when i bought my property. Never claimed throughout the years, until 2021 Jan when my geyser burst. Less than a month later, i got a rerate letter with a 37% increase on my premiums from R425 to R585. Nearly 4 years claim free and i'm penalized for 1 geyser burst claim. I have called in twice already trying to get a better rate but to no available. I have never skipped a payment even through the covid bad times, with salary cuts. Im being told the same story of how its not a punishment but rather a way to ensure that Outsurance may keep up with my property value. My property value has not gone up by even 15%. Im really considering cancelling both me and my wife's policies too if this is how we treated if we make a single claim after all these claim free years. Surely got me thinking what will happen with my life policy if i die, seeing how they treat me while i'm still alive with my other policies.