If your dad gets declined with a Plus loan, then your Stafford loan gets increased by about $4k each year. However, you're talking about private loans of $16k per year-about $65k for all 4 years PLUS your Stafford loans of about $30k. That's over $90k in loans.
This written warning is being issued pursuant to the guidelines of the University Disciplinary Policy, and will remain active in your personnel files for 12 months or until you receive at least an overall evaluation of Good and a Good on Principal Function 2 which covers your reporting responsibilities.
The only way the system operates is by a dispute letter directly to the credit reporting agency, regardless of whom is furnishing incorrect information on you! Once you have submitted a proper dispute, wait up to 45 days for a response. If your credit report is fixed, then you need to do nothing further.