debt

My father died last february 2020 and back on january there was a private hospital whom he got referred to from the provincial hospital. We are not well off so we just stayed there for 9 hours. He was just in an emergency room for 9 hours. Before we left the doctors told us to pay 18,000 PHP. We didnt have that much money so they told us we can pay that after months but then my father died after we transferred him to a public hospital (because of many body complications) we were so devastated that we forgot the debt. Fast forward this July 2022, the hospital sent a letter saying we should pay the debt within five days or they'll sue us. Im just a college student. i dont know what to do. my mom only have a small store that pays just fine for us three( my brother who's also in college.) we dont do debts. This just the 'one debt' that we ever had. At this point, Im ready to sell anything I can give even my body. i know that sounds so stupid but i just need to let it all out. today is day 2 we still have 3 days to pay. i dont know what to do.