Short sale done, received letter from attorney

[Brian Osgood]

Hello all,

So I'm looking for some advice here. My house was sold as a short sale, we closed on 11/4/09 and there was a first (Washington Mutual, now Chase) and second (Citimortgage) lienholder involved. I recently received a letter from an attorney in regards to the remaining balance on the Citimortgage note. The letter says I have an outstanding balance and must respond within 30 days of receiving the letter as to the validity of the debt. If I don't respond, they will assume the debt is valid and proceed in accordance with that assumption, etc. Any advice on what I should do? What response exactly are they looking for? Please help! Thanks in advance!

Brian