I have a flight booked on VX from LGA-DAL on Thursday at 3:35 i need to change it to earlier in the day but when I called they said because it is a flight booked with miles they can't change it and the only thing i can do is cancel and rebook i also can't go on standby for the same reason and on top of that they charger 100$ to redeposit their miles anyone have a suggestion?