UNSATISFIED WITH SUDDEN INCREASES IN THE POLICIES

I need explanation I requested a quote for a car and was quoted R 835.53 on 30th May 2021 and I accepted the quote and received the policy documents on the 02 June 2021 after a week on the 20th June 2021 the policy changed an amount to a higher amount R 1107.33 without informing me together with other cars that are already on my cover also changed the amounts to higher amounts the amount changed three times in one month like what is the explanation for all this increases three times in one months .I need a response before i cancel your insurance you misled me with your first quote knowing that you will adjust the amount at anytime I will accept this kind of treatment .I need explanation before i approach Insurance ombudsman