On Facebook there is a group called I got my refund. Look on there. One of the most recent post has a phone number for the tax advocate hot line. They will help if you haven't spoke with your TA and step in if not assign you a new one. The last time I heard from mine was also a letter saying that she will contact me on April 2nd. I called her last Thursday and left her voicemail saying it was urgent and still no call back.
