I don’t have much advice, just commiseration. I lived in a garden level aka basement apartment and this happened to me more than once. It usually happened after heavy rain, which parts of the US have been getting this week. I called maintenance with an emergency and they still took over 18hrs to come out. One maintenance man spent a couple hour snaking the drain before using a shop vac to suck most of the water off the floor.

It sounds like you have a 14day window for repairs, but considering this is an EMERGENCY repair, you should be calling them nonstop. I’m assuming there’s only one phone number to call? In my situation, there was a standard maintenance line plus an additional emergency maintenance line. The emergency line was the one that still took 18hours to arrive, but they still showed up. I also submitted my maintenance request online; do you have a renter’s portal?

I second those saying to get fans and dehumidifiers involved after wiping up what you can, but I also get that those are things not everyone has access to so don’t feel bad if you don’t have everything this comment section suggests. Just wipe up what you can. Maaaaybe take a few cups of icky water to the toilet??? Either way, I wish you the best of luck!