Nenkin as student?

Hi, I just turned 20 and got my first nenkin bill, which had way too many bills and some overlapping with each other, so I chose to pay one bill for each month going up to the next fiscal year, which was about 17500 each adding up to around 200k, which is quite a lot for me. As a student on a student stipend with no income I've just submitted the form for exclusion from nenkin for the period that I am a student, but I don't know if they'll refund the money to me. Do I need to pay nenkin as a student? Do I need to pay after graduation? Will I get a refund if they confirm my student status or will they put it into some sort of fund account that I saw on the form?

by Middle_District_4275