Consumers who believe they may be due a refund under a recent Federal Trade Commission agreement with the Bally health club chain, which operates Holiday Health Spas in Maryland, have until the close of business Monday to call the FTC hot line in Washington.

The deadline of April 25 was set this week, when a federal judge signed a consent order that gives legal force to an agreement between the Bally chain and the FTC.

FTC investigators had found that Bally charged credit cards or debited bank accounts without authorization, used harassment or deception to collect on consumer debts and failed to give pro-rated refunds when customers canceled memberships.

The FTC hot line number is (202) 326-3341.

Dana Fox, Maryland assistant attorney general, said if you didn't have a written complaint on record before the consent order, the hot line is the only way to preserve your rights under the agreement.