@eeppeerr88, If it were me and the doctor said that I would look for another doctor. There is another discussion on scar tissue after knee replacement that you may want to read through and learn what other members have shared:

Scar tissue after knee replacement: https://connect.mayoclinic.org/discussion/scar-tissue-after-knee-replacement/

There are several treatment options that you may want to look into -- What are the treatments for arthrofibrosis?:
-- https://www.healthline.com/health/total-knee-replacement-surgery/arthrofibrosis#treatments

Have you thought about seeking treatment at a major health facility like Mayo Clinic or a teaching hospital?