Did you book a land/sea package or a sea package only?
If you have a land/sea package, it should come with the transfers unless you specifically requested they remove them.
Mears is the actual company that comes to pick you up and drop you off. They are contracted by Disney. From what I have been told, 90% of the time, when you are picked up in a "Disney" busm it is Mears. You can contact Mears 24 hours prior to the time you need them and book transportation.