You will have to contact Twitter directly for this:

www.twitter.com/help/escalate

Twitter no longer Verify accounts, this changed earlier this year, unless your client is a 'star'

What constitutes being a "star" I have 2 NFL players...one is the starting left tackle for the Jacksonville Jaguars, Eugene Monroe and the other was selected by the New England Patriots in this year's NFL Draft. They have expressed to me on numerous occasions that they would like their Twitter accounts verified. We are not in the business of disappointing our clients and we have seen a few NFL players have their accounts verified since the termination of the Verification process. On in particular is a former client of our who was selected in the 2010 NFL Draft and starts a tackle for the San Francisco 49ers. Please contact me by phone 302-494-7751 or email terrance@320inc.com or just reply to this email at your earliest convenience. Thanks for your time