I live in the Caribbean - I have packages sent to a Miami address and then forwarded.  We do not have a reliable postal system and there are no home deliveries.  I have to rely on vendors 'getting it right', because returns are uneconomical!
The sandals delivered to me were size 9M in a 10M box.  10M were ordered.  While the new sandals can be worn - they are tight and uncomfortable.
I use Amazon often and rely on your normally good service.

Keith Osborne