Erinzip,
TransUnion credit reports mostly show lots of errors in the consumer files. You need to dispute with them and get the exact date of removal. It might be possible that LVNV does not have your account and have hit the credit file without any legitimate reason. To be confirmed, ask from the collection agency for a complete debt validation. If they are not working on your account, they don't have the legal rights to appear in your credit file.
When an account turns delinquent, you will need to check the SOL period as per the statutes of each state. This will make you sure whether the account is still in legal collection period or not. The date of last activity is counted in this matter. After the expiry of the statutes, you just have to dispute on it and need not to make any payment agreement.
The FCRA laws mark the 7 years reporting time beginning from the date of first delinquency. Though the debt might be out of the SOL period, but it will remain in the file till its reporting time has not expired.
You have to contact the bureau first and get the actual standing of your credit. You can also keep a follow up with the collection agency as well.