Exhaubitant increases in insurance premiums

My Name I Zanele and my husband and I have ensured our vehicles with Auto and General for a couple of years now. While we have no issues with the service, our premiums have however increases exaubitantly each year. Last year they were increased by over R500 which we did not contest. This year they were further increased by over R600. Considering that our vehicles are now paid off and are depreciating in value as well, we find these increases to be very high. This is very frustrating as we do not want to change insurance companies but may be forced to if this is not addressed/rectified.