OP needs a lawyer. OP received a PFL with a potential 5 year ban and didn’t respond to it within 10 days. Since didn’t respond, IRCC may enforce a 5 year ban which is very difficult to overturn and needs a lawyer to go to federal court. Even then, it may not be overturned. First OP needs to find out if 5 year ban was enforced.I will recommend you get an IRCC-regulated consultant that knows his beans. Not really a lawyer, you are not going to court. However, I can tell you for free that if you don fix the PFL before applying for a study visa, you will get denied 100%. So get an IRCC-regulated consultant and let them tell you the right way to fix it.