Please help

Hi I am Carol Ann fisher I have a concern about this insurance company ( Salt sector retirement fund and funeral) since 2016 I have being paying a premium of 181.84 for my 4 aunt's each now they want me to pay from 1 December 2021 897.84 per person and my 3 brothers and my daughter premium used to be 37.02 now from 1 December instalment raised to 135.55 normally my instalment for all was 1000 rand this was the last month end October that I still paid it now from end November beginning December I have to pay 3770.30 is it's fair fair that a premium goes up with almost 3 times the amount I used to pay please help