Facebook and Instagram owner Meta is ​bringing a legal challenge against Britain’s media regulator ‌Ofcom over how fees and penalties are calculated under the government’s Online Safety Act, London’s High Court heard on Thursday.

An Ofcom ​spokesperson said in a statement that fees and penalties ​under the law are based on a provider’s ⁠qualifying worldwide revenue.

“Disappointingly, Meta is objecting to the payment ​of fees, and any penalties that could be levied ​on companies in future, that are calculated on this basis,” Ofcom said.

A Meta spokesperson said in a statement that “We and others in ​the tech industry believe (Ofcom’s) decisions on the methodology to ​calculate fees and potential fines are disproportionate.”

“We believe fees and penalties should ‌be ⁠based on the services being regulated in the countries they’re being regulated in,” they added. “This would still allow Ofcom to impose the largest fines in UK corporate history.”

Britain’s ​2023 Online Safety ​Act sets ⁠tougher standards for social media platforms such as Facebook, allowing Ofcom to fine companies ​up to 10 percent of their qualifying global revenue.

The law also ​requires Ofcom to ⁠recover the costs of running the regime through fees charged to service providers.

Ofcom’s lawyer Javan Herberg told the High Court that Ofcom “intends to issue ⁠invoices (for ​fees) in Q3 of this year, ​most likely September”, and could have to pay refunds if Meta’s challenge succeeds.