try this way:
1.go to Support Center and make a ticket
https://poloniex.freshdesk.com/support/tickets/new
you will not get any response
2.mail to
marketing@poloniex.com and ask for help
tell them your problem and ticket number in step 1
3.repeat step 2 every day
4.clean catch and cookies in browser
5.try to verification account again
I send mail twice, no reply, but I can verification account again
hope this will help
* try to close your anti virus before verification *