The whole story sounds odd to me. (1) What could have instigated the argument about the 5 day upgrade window anyway? Did the OP call on D-6 complaining about no upgrade? And (2) what phone line did the OP call? You can't just call the regular NW number and ask for the "Platinum line". If DL has messed up the routing of the Platinum number then that is worth starting a thread and alerting DL. But that isn't stated here.