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The account is still owned by Citibank
Since it was passed to collection agency once, please check again whether the account is with a collection agency or citibank.
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Bring it current and increase payments (balance is 11,000 - I'm paying 150/month, 1500 past due)?
Most of the companies have some plans for making an account current, like after 3 continues payments.
IMO, contact the customer care once again and ask them how to proceed and whom to contact in such scenarios. Offering a lump sum will help you impress your creditor. Some tips while contacting original creditor is given over at
http://www.debtconsolidationcare.com/contact-creditors.html .
Thanks
Vikas