can't even play a single pvp

hey guys im playing neomonsters for 2 months 

and im in lvl 65 and beated champions league and further

still i cant play pvp

everytime i try to play it says     " oppenent couldnt found"

pls tell me how to resolve the problem

When that happends to me i just keep trying until i find someone if that doesnt work for 2 or 3 times i just reset the app, thats all the help i can give you

I had that problem for almost a year and i message the neo mons facebook. Finally i can play pvp this year. Well i have an iphone 5s and tbh i do not like to update its version. But for the game i did it once. Maybe that was the solution.