Attorney General Phil Weiser has notified Comcast and DirecTV that they may have committed a “deceptive trade practice” by charging customers a sports fee while blocking out coverage of Nuggets and Avalanche games.

Weiser told The Denver Post that the Colorado Consumer Protection Act gives him the authority to levy penalties.

“We will be reasonable and thoughtful in how we use it,” he said. “This is putting people on notice.”

The principle at stake in this instance is companies changing their product offerings without compensating existing customers. Weiser’s letter said that he is looking into other potential fraudulent charges.

Violators could face penalties of up to $20,000 per act.

On Friday, Altitude Sports, the cable and satellite sports channel which Comcast and DirecTV blocked, announced that it would begin coverage again through a deal with DirecTV.

“”This is tremendous news for the fans of the Denver Nuggets and Colorado Avalanche who have had to endure missing their teams at the start of the seasons,” Altitude TV tweeted about the deal.

Comcast said that they have already given a partial refund to their customers. Dish Network is the other company without a contract with Altitude.

Weiser asked both companies to respond to the letter by Nov. 7.

A spokesperson told The Post that “based on early conversations with DirecTV and AT&T, we didn’t believe they were taking the request with the seriousness that they should.”