The user named   Aertemys commissioned me for one of my YCH slots for 30 USD.
That is fine and dandy, I completed it within days of being paid, they were happy with it, said they loved it, and even have it in their gallery.
Fast forward 2 MONTHS later, and they are trying to refund it through Paypal and now I have a negative paypal balance.

DO NOT LET THIS PERSON GET ART FROM YOU.

I am a single parent of a disabled child, I have literally 4 dollars in my bank account to last the rest of the month and this person has added unneeded stress and refuses to reply to any message.

For the sake of your own stress? DO NOT LET THIS PERSON COMMISSION YOU.