Coaching Institute Taking False Credit for a JEE Topper

I wish to reveal a dubious practice going on at my school. There is a student who just scored 99 percentile in JEE Mains, but here's the twist—he NEVER went to the coaching institute that is now claiming credit for his achievement. This student studied only online courses from Physics Wallah and never entered the coaching even once. But now, the coaching institute is taking his result on their advertisement, lying that he was their student to get new admissions. I posted a comment on their Instagram page from an anonymous account, accusing them, but they blocked me rather than replying. This is not just unfair to the student, who studied hard by himself, but also to first-year students who may fall for their false assurances. Coaching centres must be honest, not rig results for business. Has anybody else witnessed such a scam? How can one expose them even more?