Sprint navigation charging now?

[flacab23]

I have a grandfather plan (everything for $119.99 monthly). This was the plan that came out before the $99.99 plan. The reason I keep it is because I am able to use my work discount and phone as a modem option. I have always been able to use Sprint navigation but for some reason now it wants me to pay for it. This was unlimited in my plan and have had it for over a year this way. When I called them tonight they told me that they are sorry but I have to pay for it now. I a told him that this is a change to my plan that I didn't authorize or know about. They said sorry. I this a breach of contract or can they just do what ever they want? Back in september I called with a question and the lady in retention extended my contract another year and I am still fighting with them over that because they won't change it back. I told them I never agreed to it (they have nothing in writing nor do they have a voice recording of the conversation) what should I do?