You have at until the entry of discharge, or 60 days after you signed the reaffirmation (if that is a later date), to rescind. You should send the notice by certified mail, so that you have proof for later. You may want to file a notice with the Court of your rescission with a proof of service showing it was timely sent to the creditor.
Nothing contained in this message should be construed as legal advice. Brett Bodie, Attorney. http://sanfernandovalleybankruptcyattorney.com
Mr Bodie is absolutely correct.
After you rescind the agreement, you can request that they return any payments you made under that agreement; but if they're not cooperative, the cost to pursue it may be prohibitive.
You have until the later of (1) 60 days after signing the reaffirmation agreement or (2) the date of discharge. Since you can never be certain when the discharge might be entered, it is best to rescind your reaffirmation agreement as soon as possible. The steps suggested by my fellow lawyers about creating a "paper trail" are sound.