Make up duty

Hi I am currently a Nursing student in Manila. During my duty day last sem, I was considered absent by my clinical instructor even though I was able to report inside the 15 min grace period. Now my enrollment is on hold for 2nd sem and because our policy is 1 absent : 3 make up duty, I am burdened by the expenses. I would like to ask your opinion since the fee being imposed is 350/hr x 8 hours divided by the number of students (in our case 6) for 3 days take note that this is tax free. I already insisted that we were not late but the coordinator wont hear us given i have picture of our time reported that day. It also burdens me because technically we have no duty to make up since we still did our duty that day. I need immedite help because in reality, money is money considering how high the tuition is already.