He added: “FIFA regrets this error and any inconvenience it caused. The tickets requested by these fans are still reserved for them, and they have been invited to complete the payment of the correct amount.”

This is the latest flaw in the World Cup ticket selling program, which has sparked a lot of controversy, and is currently under investigation by the attorneys general of the states of New York and New Jersey for possible violations of consumer protection laws.

FIFA explained in an email to buyers that the mispriced tickets were sold through the official World Cup website on May 21.

That date came more than 3 months after FIFA President Gianni Infantino announced that all 104 World Cup matches had been completely sold out.

However, FIFA is still offering tickets for sale for the tournament matches that start next Thursday in Mexico City.

It is still unclear whether ticket prices for less-demanded matches will decrease within the variable pricing system adopted by FIFA, which has sparked widespread criticism among fans.

FIFA also runs its own resale platform, and charges a 15 percent commission from both the seller and the buyer, in an attempt to limit the activity of ticket brokers. But other ticket selling platforms, such as “SetGeek”, were offering on Friday the availability of a large number of tickets for many matches.