Among the providers in Argentina, which supplier has an account that is in debt?
Argentina refers to n_name = 'ARGENTINA'; supplier refers to s_name; an account in debt refers to s_acctbal < 0
SELECT T1.s_name FROM supplier AS T1 INNER JOIN nation AS T2 ON T1.s_nationkey = T2.n_nationkey WHERE T1.s_acctbal < 0 AND T2.n_name = 'ARGENTINA'