Today I was suppose to start working for UPS as a seasonal driver helper. I was told they would call me between 9-11am. I never received a call. On Saturday, two days before I was suppose to start work and two days before my availability started they called me and asked if I could work that day. I declined because I had to get stuff together to start work today. The manager told me they would call me on Monday between 9-11am and to not call them at all. What should I do? Why did they not call me today? How do I contact them if i am not supposed to call the number back?