Merging Pro Accounts

Hello There,

We have 2 pro accounts say "A" & "B".

"A" have been recharged with quantity of 2 users Ignorantly.

"B" Due for recharge in couple of days.

As per my understanding I can assign 1 user (not assigned yet) to another email.

Question:

1. Can I assign 1 unused user of A, to pro license account of B - Yes/No.

2. If Yes - What will happen to another pro user personal zoom id which we are conducting meetings.

3. If No -  If we can cancel the 1 user which is not used does zoom gives the refund.

Please help