Liberty Mutual Insurance

Cheri my agent was mad at me because I switched insurances on 2 policies. The reason is I got $180 off on my auto so it was a better deal. And the reason I got that was I don't drive much. Cheri said that they are not allowed to ask me my miles as it is against company policy. My daughter just switched last year to Liberty Mutual and that agent offered it to her. Liberty Mutual has totally changed the amount I have to pay which is wrong. I see today they added another $100 to the yearly amount. How can they get away with changing the amt?