alltel Alltel charged roaming fees to my acct and I am supposed to have unlimited access Phone , Text and Wireless they should not be able to charge roaming fees if indeed it is UNLIMITED ACCESS Carol Stream, Illinois

I have had Alltel cellualr services for over a year and as over the road truck driver I travel alot in a regional are mostly Illinois, Indiana, Kentucky and Tennessee and in that year I have not been charged any roaming fees until recently. I travel quite frequently up and down I-57 which runs north and south in Illinois and this is where they charged me just north of Champaign Illinois.  They did however remove the charges but also stated that they could charge me roaming charges if I hit another tower this to me does not seem appropriate if they say UNLIMITED that should mean UNLIMITED