Debt collection in PA is governed by the Federal Fair Debt Collection Practices Act (FDCPA) and the state Fair Credit Extension Uniformity Act.
I am not quite sure what you mean by freeze your bank account. If you mean that your funds have been levied, then yes that is an acceptable practice if the creditor has obtained a judgment.
DISCLAIMER
While I am licenced to practice law in your state, I am NOT your attorney, the above is NOT legal advice, and an attorney-client relationship has NOT been created. The above is provided for informational purposes only.