The fine was still a part of your sentence because you weren't resentenced on your violation of probation. The sentence you received the second time was not a sentence on the original crime, but rather a new sentence on the violation of probation.
That being said, there is a six year statute of limitations on collecting old debt in Pennsylvania. Consumerist.com suggests that you send a certified letter disputing the debt and asking for verification that the debt is legal and not time-barred. It says that at that point, the collection agencies usually give up.
The statute of limitations applies to any entity, including the government. Especially now that the old debt has been bought by a collection agency.
Here's an article about what to do with these collection agencies that are trying to collect old debt that might help you out:
And here's information and a link to a sample letter that you can tweak to fit your situation:
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).