TOMSMen's Recycled Cotton Alpargata Loafer Flat

Do these come up a little small are are they pretty much true to size?

I am trying to get in touch with the seller as I have received the wrong size order twice now. How can I do this?

Are these Genuine Toms? If so, why you sell halves on here and not in the shops? Thank you.

Are these definitely vegan? No pig skin used?