More than 20,000 Comcast customers in Massachusetts will get a refund or have their debt with the cable company canceled, Attorney General Maura Healey announced Tuesday.

Healey said in a statement that Comcast is settling a lawsuit that alleged the company “violated state consumer protection laws by using deceptive advertisements to promote its long-term cable contracts.”

Comcast allegedly left customers stuck in agreements they couldn’t afford, and didn’t properly disclose fees that raised bills 40 percent above the advertised price, according to Healey. When customers tried to cancel, they were charged early termination fees of up to $240.

“Comcast stuck too many Massachusetts customers with lengthy, expensive contracts that left many in debt and others with damaged credit,” Healey said. “Customers have a right to clear information about the products and services they buy. This settlement should encourage the entire cable and telecommunications industry to take a close look at their advertisements and make sure customers are getting a fair offer.”