Annual Premium Increase of 50%

Changed to Hollard Insurance a year ago, (with previous Insurer for 30 years). Contacted their Contact Centre with regards to my premium increasing by 50%. Was told this was inflation and my risk profile. My risk profile could not have changed as I had no claims and inflation definitely not 50%. Was told that is it, my premium can not change so I have enough time to cancel and find another insurance company. Shocking service!