Negative balance,what should i do?

Hi,my Paypal acount has a negative balance of €80.
So i traded a steam acount for a Runescape acount,the deal went smooth we hadnt any problems at all.couple of hours later i found someone interrested in the runescape acount so i sold it to him,2 days later the acount gets locked for no reason since i am not the orignal owner i couldnt unblock it so i contacted the original owner to unblock it, he couldnt unblock it so he decided to open a paypal dispute and he won now i have a negative...

Negative balance,what should i do?

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