It's pretty common for
UPS to train many drivers then not use them. It's like insurance so they do have someone in a pinch. Hopefully they will need you soon. It's also possible someone inside the building will quit or move up the ladder leaving an opening.
Once in awhile our center needs helpers on certain routes and use seniority employees from inside who want the work.
Seasonal hires have it rough because they are not in the union yet and have no real right to work. Company will use you if and when they need you. Hang in there, turnover is high and the summer is young. Best of luck to you! dw