My friend has the same problem, She has 3500hrs, 1900, C208, A320 ratings with 1600hrs instruction and she has done 4 years of contract work in west Africa. Everyone wants 500 hrs on the A320 before they interview you.
As for myself, i get the same story. I have over 15000hrs on B738, B744, A330, A340 but only have 75hrs command on the A320 with instructors ratings on A320/330/340 but still they need 500hrs P1 before i can get an interview.
You can't win