Cargo Pilot ( Select a flight )

I have tried this flight several times and level at 35,000 as per IFR flight plan , but keep getting a message from ATC to " expedite to 35,000 " and finally have my IFR flight plan canceled . I had planned to make good money flying that 747 on this trip , but am afraid my career is in jeopardy !!! HA ! Anybody else had the same experience ? Altimeter was 30.24 and they did not make a change prior to the warnings .
Thanks ,
Jamie
Thanks ,
Jamie