T-Mobile loves to get under the skin of its rival carriers and an ad over the holidays struck a nerve with AT&T.

An investigative unit of the Better Business Bureau last week kicked a formal complaint from AT&T about a T-Mobile holiday video to the The Federal Trade Commission and the Federal Communications Commission. The video calls out AT&T and Verizon as “abominable carriers” who “only cared about silver and gold and how to take it from the people of the world.”

A snowman narrator in the video, which is a play on “The Year Without a Santa Claus,” says that the carriers “put a fog over the whole industry, a blizzard of added fees, horrifying limits and bewildering restrictions, hiding real needs and wants of customers everywhere. A claymation version of T-Mobile CEO John Legere shows up to call “bullshit” on the carriers, which he characterized as “major misers.”

AT&T filed a formal complaint with the National Advertising Division, an investigative arm focused on advertising under the Council of Better Business Bureaus, in response to the ad. The carrier claimed that the ad makes false and misleading claims about AT&T and disparages and denigrates the company.

T-Mobile responded by requesting that the NAD close the case, due to lack of merit, a move the investigative organization declined to do.

Still, T-Mobile doesn’t seem too worried about it. Legere took to Twitter last week, calling out AT&T over the complaint.

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