Riders are exactly just that - they just ride the bike
and send your order to your house. Full stop. You seriously think
that they enjoy being the ones who get all the complaints in the
face?
You want to blame someone, blame the operators for not reading
your order properly enough. Or the packers who mixed up your order
with someone else's order.
Finally, does the fact that the rider is a Mat make a difference
to you?
