Bangalore University — admission to 3rd year

Hi, i'm a student from jd institute of fashion technology. Pursuing b. Sc in fashion and apparel design. 2018 dec i was supposed to write my 3rd sem exam, due to low attendance i was not allowed. I have very genuine and serious medical cum personal reasons for my low attendance.
Principal told that i can write 3rd sem exam during 5th sem, and i was allowed to attend 4th sem. Almost a month for 4th sem to end, college informs me that i can't take up 4th sem exam and i have to repeat 2year again. How unfair is this? It's not a fraud medical cum personal excuse i have genuine proofs supporting the above.
Please help me with this. I seriously can't afford to spend another extra year and also the expense for it.
Thankyou.