Pre owned coco carmen OMG..denim

I just purchased these from another posher..trying get back what I spent..they were advertised as large..which is what I wear...they were not and tag was removed from inside.which i was not aware of..so what recourse do you have to stand on??.I have put measurement photo I took to show size...I am assuming these are Xl or even Xxl...make me an offer..