The bill is in your name, so it's your bill. You can best protect your credit by paying it and closing the account, and if you choose you may sue your ex-roommates for the money they owe to you in small claims court after you return to the U.S.
The bill is in your name, so it's your bill. You can best protect your credit by paying it and closing the account, and if you choose you may sue your ex-roommates for the money they owe to you in small claims court after you return to the U.S.