Unfair treatment and a do not care attitude

They increased their prices without prior notice. I only found out at payment stage. When I ask why we were not told that there will be a price change the consultant tells me that it is a prepaid service so it was up to me continue with a payment or not. That was the most ridiculous answer I got from a company that I'm a customer to. What is this,a take it or leave it kind of business? Is that how we are seen at this company, just numbers that add to their revenue? When we raise concerns we get this nonsensical attitude and not an apology