Help with unpaid school fees of 2

Hello good humans, I'm a 15 year old who has been constantly harassed by his school management and teachers regarding unpaid fees, I have been kicked out of several important lectures, examinations, and school activities, the same applies for my 19 year old sister, she also has been denied access to online classes as mentioned in the screenshot of the email, its a painful experience to be shamed in public, my father is too old to work and my mother illegally tutors children at home for some money but Covid-19 has completely knocked us off our feet, we now have no way of income whatsoever, we have several unpaid housing rent but I'm too ashamed to ask more, my sister's pending fees is 5445.46$ and mine is 2,000$ but I feel extremely pitiful for my sister as she is aspiring and young and filled with energy, she deserves her education more than I do, if you do not wish to donate, please share this link for it will be very helpful and yes if you require any further proof, please let me know