well you can give him the accounts he purchased and replace if the accounts stopped working then. You are aware he purchased from you so this is no excuse.
I'm okay with this, but he didn't want replace, he just asked for refund.
I told him I'm in exam week so fixing these accounts is gonna take time(fixing same accounts, not replacing with another). So I purchased 7x netflix uhd premium accounts for him so his customers wont complain until I get available, and I asked him before doing this, he said "Ok."
But after 12-15 hours of I bought these accounts (this means I replaced them for temporary) he said "I refunded them, please refund me"
So I wasted my 80 usd (buying from another seller for just 2 days) for nothing, in 2 days my midterms gonna end. but he couldnt wait even tho he was ok with that.