I requested for change in plan from 500 to 500C on December 20th and it was changed promptly from January 1. I again asked for a change in plan from 500C to 750 UL on January 20th(and was told that it will change from Feb1) and when i checked now(Feb 1), neither the speed(has to decrease) or the entry in billing site(still showing as 500C) has changed. Can i use my net considering it as UL or better to wait and watch? And exactly when these plan changes occurs?