Do you have other options? Do you have FTTH? if yes, you may try to gamble and you may save few $.
I had it for $25. In order to get an offer from "win back", I had to place a request for cancelation, been waiting for an email. Got offer the same 500u for $40/m. Yes, for me it is $15 more, but I do not have FTTH? Any third party providers probably would not give me 500u for $40.
You may win, but if you have no plan B....