Changing premium every few months

I have had insurance with this company for about 8 months now and my premium had gone up about 2 times now. What they do is they give you a very low premium the first time you apply so you think this is a great deal and you will be able to afford it, then they start increasing you premium every few months. First i got the insurance and i where paying R900, a few months went by and they phoned me and told me that my insurance will go up. I thought this where fine as i had an accident in november last year. My premium increased from R900 to R1300, i did not complain and payed my insurance every month.<br> This accident happened in november 2014, on the 7th of July 2015 i received an email from them telling me my premium will increase again due o the accident i had in november 2014. When i phoned them and asked them why they said its due to the accident which i did not understand. They said the previous increase where because i changed my address. So what i dont understand is for a address change the increase the premium R400 and an accident the increase R300. This does not make sense, do not get insurance with them they trick you.