I submitted a 24 pages paper to a good journal - say usually in the top 10-20 - of pure maths, and after 14 months from the submission I haven't received any report. The last news I had from the editor date last may. Then I tried to contact him in september but no answer. What would you do? Wait? Write again? Withdraw the paper?

It is not a VERY TOP journal (top 5 for instance), hence I think a rejection would be pretty difficult to accept after such a long time.