I am not really certain if your Greek subsidiary is a partner that just carries your trademark or a full subsidiary … but it just outright sucks. And you may want to look into it.
I could waste a number of keystrokes on the matter, but a picture is worth a thousand words:
2 working days (20 & 21 December) for a package to travel from the US all the way to Greece. Hopefully 4 … FOUR! working days (22, 23, 27, 28 December) for the package to travel another ~440km from Athens to Katerini (1 hour away from Thessaloniki, the 2nd largest city of Greece).