from personal experience the best thing to do is go into the bank, talk to the bank manager, and sort out a way of paying it back monthly, if you don't do anything, they'll put you on a blacklist, you wont be able to get any type of credit, loan, phone contract ect, to be honest, its not a large amount of money (in the eyes of a bank) so i think you should be able to do something about it before they take leagal action. i would imagine that they have you localized, all they have to do is look on the social security to find out who's emplying you.
so your best bet is to man up and go personallyinto the bank, don't worry, they wont bite your head off