unbelievable

can also not understand what's so hard to credit the miles back. they can exactly see in your profile for which flight they were used - they can then check the booking - there should be a verification or something like that in it (from you) so that they can debit the miles from your account - if not you can see who has processed the upgrade/mileage ticket.

have you checked if someone put himself as a travel coordinator into you profile?