Premium increase of more than 100%

Hollard increased my monthly premium without ANY notification with more than 100%. My monthly premium had gone from April2018 = R1913, May2018 = R1913, June2018 = R1947, July2018 = R2723, Aug2018 = R2822.

Hollard is nowhere to be found and coming with resolution to the premium increases and willing to refund the differences from initial premium to incorrect premiums. My broker has been trying to fight this and explain to Hollard to explain who my home content had increased with more than 105% without notice or justification. The vehicle premium was rectified, but household insurance is still a pain!!!!! Hollard says there were many endor*****ts but unable to justify or provide any feedback on who submitted these and where these came from NOR are they willing to rectify my household premium!!