Personal Bankruptcy Creditor will not recognize reaffirmation rescinded

[amber1226]

I recently had a Chp 7 discharged. I had initially signed a reaffirmation agreement with my HELOC and it was entered in court 6/20/08. On 8/15/08 I decided to rescind it and my lawyer sent the recission letter first class (I was told it was going to be overnighted) on 8/20/08. The creditor said they received it after the discharge date of 8/26/08 and now want payment for this debt. I intend to let the house go into foreclosure but I will now be responsible for the deficiency balance on this debt because the creditor doesn't recognize it as discharged. What can I do?