(Adds comments from Telcoms regulator, America Movil)
MEXICO CITY, April 18 (Reuters) - Mexico's telecom regulator IFT said on Wednesday that it has fined billionaire Carlos Slim's flagship company America Movil and its mobile service unit Telcel 96.8 million pesos ($5.4 million) in an antitrust case.
The IFT said it fined America Movil and Telcel for having "exclusivity agreements with Blue Label Mexico, which prevented the company from marketing or providing" services for Telcel's competitors in the mobile telephone service.
Blue Label provides technical and banking support to retail businesses in Mexico, according to the company's LinkedIn page.
"We have already received the notification from the IFT. We are analyzing the document and in due time we will present the challenge in accordance with law," an America Movil spokesman said.
Blue Label did not immediately respond to a request for comment. ($1 = 18.0630 Mexican pesos) (Reporting by Julia Love and Anthony Esposito; Editing by Dave Graham and Himani Sarkar)