I called union they said company had the right to reinstate your days off even if the agreement up front was that I was selling the days off.

Right...VDO is correct term.

I have a suggestion.....If accepting a VDO assignment, insist that the correct funds be transferred to a Swiss Account and do not head to the airport until the funds are properly accounted for.

Regardless of what a screenshot looks like or not, it doesn't change the fact that schedulers do things to your schedule, and therefore your payscreen after you depart on the trip.

What excuse does the company use now for sticking this stupid pay system upon us???