After you file

I Just really wanted know why my Refund is still saying still being processed. SMH.. I filed my Refund around the beginning of February and around the 21 i received a letter saying that they needed to do a verification on my Refund. The IRS said in the letter they needed 60 days and i didn't have to do anything else at this time. Please allow up to 60 days. I haven't received any other letter in between those 60 days as requested by the IRS. My 60 day was up on April 13..  I sent a letter along with a copy of the letter that they have sent me.. Now it's 92 days in counting No letters No Reund No Stimulus check. How could this happen When a Top Tax preparator did my Taxes.. The IRS is still not taking any calls.. I need some help to how can i get in touch with The IRS Verification Department... SMH..