Stay calm, explain
I once was refused to enter the UK because of too many to often stamps on my passport because of oil work and attendance to bike rallyes.
Other time my French residence expired while inalasia and as Amsterdam border police made buy a return ticket to Venezuela
Usually they dont that like you use your phone in there.
Did they let you in after you explained @nnnarvaez?
Not in the UK and I had a cross (refusal) stamped on my passport that banned me from the UK for undetermined period.
But Anomadsoul should have a return ticket or a ticket leaving the Schengen space which usually is indicator enough that he is a compulsive traveler
noooooo that sucks, I'm sorry!