Erase Credit-Union Auto Loans

I need experienced credit-repair assistance focused solely on deleting two closed auto-loan accounts that are still being reported by a credit union. These entries are hurting my score even though the balances are zero, and previous online disputes have been unsuccessful... (Budget: $15 - $25 USD, Jobs: Accounting, Contracts, Credit Analysis, Credit Repair, Financial Consulting, Legal, Legal Assistance, Legal Writing)