I began working with an online platform as a lecturer for one of the university subjects. The arrangement was that I provide (60%) of the content, and the platform manager takes (40%) for advertising the course, as well as uploading the videos to the platform. Lately, I've noticed a lapse in the platform's responsibilities. I handle the teaching, advertising, and video uploads, while they haven't fulfilled their agreed-upon duties. Is it permissible for me to take the full (100%) considering their non-compliance with the agreed terms? I have informed the responsible party about the shortcomings, but it has been to no avail. Consequently, I decided to work independently without using their platform and take the full percentage. Is this permissible?