California state regulators say AT&T lied to the Federal Communications Commission in an attempt to shut off its old copper phone network without providing an adequate replacement.

“AT&T asserts that California seeks to prohibit or hinder wireline carriers from discontinuing copper facilities and investing in fiber,” said a June 15 filing by the state of California and the California Public Utilities Commission. “Indeed, AT&T has been making this argument for years. It is not and has never been true.”

As we reported last month, AT&T sued California over the state’s refusal to let it stop providing phone service to all potential customers in its wireline network territory. AT&T also petitioned the Federal Communications Commission to declare that California cannot enforce its rules and to let AT&T stop providing service to about 199,000 phone customers.