The Federal Antimonopoly Service (FAS) of Russia said telecoms company MTS violated anti-monopoly legislation in raising the price of some mobile tariff plans well above inflation.

FAS said MTS would have to lower prices to economically justified levels and pay a fine, the size of which would be determined after an investigation.

MTS said it had not yet received a formal ruling from the FAS.

MTS in a statement said that the adjustment of tariffs took into account the growth in costs of servicing telecoms infrastructure, which exceeds the growth of telecoms service revenues. “The company will study the FAS’ arguments after receiving the official text of the decision.”

FAS said MTS had raised the price of mobile services for more than 28 million subscribers by an average of 9.5 percent, basing this on a rise in its costs.

In August, September and October 2022, MTS again raised the cost for these tariff plans, FAS said. The general increase in tariffs was more than 20 percent at a time when the consumer price index stood at 10.5 percent at the end of August.

FAS said MTS had not provided enough evidence of its costs. MTS said it had submitted the necessary proof.