argh!

[erastes]

What do you DO when your publisher ignores you regarding recovery of rights?  The rights were up at the end of January, and I told them months ago I would not be renewing the contract. I even had a response to that email, so they can't say they didn't know.  However, I need a formal letter to rescind their rights.  I've  emailed them three times to no avail. I suppose the next step is to send a recorded delivery letter?  I am not a happy bunny right now.