UGGMen's Kenton Slipper

Since the heels are collapsible if you wear the with the heel down do you slip out of the shoe? Are they safe?

My husband wears a 10.5 should I order 10 or 11?

I canceled my order a few minutes ago & you charged my card, when will i have money back?

If you wear them collapsed for awhile and then want to switch them to non-collapsible will they work and feel comfortable alternating them? Thanks