last thursday, i went in to my center office to pick up my check stub. the driver whose route i covered for my training route wasn't in the mood to work that day so he asked the center manager if i could cover his route for that day and he go home. she said, "sorry, but no." i went home because i had already worked preload that morning. i went back to work the next day (in the preload) and found out from another employee that they had worked the cover driver who is directly below me on the seniority list. apparently a full time driver had gotten sick on route and they needed someone to cover his route right away. well i live an hour away from the center, and the less seniority cover driver only lives about 10 minutes away from the center. i never received a phone call from any of the supervisors that day asking me if i wanted to help. i also figure that since ups is trying to save money right now, they thought they were better off if they called the cover driver who "hadn't worked yet today." (i had already worked that day in the preload. the guy they called hadn't worked yet because he works twilight shift. hence- they wouldn't have had to pay me full rate to cover the route.) i grieved it for the pay that i missed out on, but ups refused to pay. do i have any options here? on what basis can they refuse to pay this- isn't it black and white? they have to use the cover drivers in seniority order.