Don't worry. In case, CitiGroup bankrupted, there will be new owner to charge the bank and most of the operation will be continued. Since there are alot of bigger debts, the new owner will concerntrate to talk the biggest debtors. In this time, no one will bother to talk to you and just let your repayment paid as usual.
Moreover, your debt is an asset (account receiveable) to the new owner, they would like you to continue repay the debt.
Therefore, you will repay the debts month by month as usual.