Facebook Audience Network (FAN) - Payout Issue


Since long time i am using FAN, But recently i have changed my Payout Account Information. But the thing is 2 days back i have received the Invoice of my payment from FAN. But they have not used my new Payout Account INFO.

They are using my old Account Information for the Invoice though i have updated my Payout Account.

Please tell me if anybody have faced the same issue with them. Please Let me know what are the steps i have to take to update my Payout Account.