Sprint has agreed to pay the Federal Communications Commission (FCC) a record $7.5 million fine to resolve an investigation into the mobile wireless company’s failure to honor consumer requests to opt out of phone and text marketing communications.

The FCC announced the record fine and Consent Order Monday. The multi-million dollar figure marks the largest Do-Not-Call settlement ever reached.

“We expect companies to respect the privacy of consumers who have opted out of marketing calls,” said Travis LeBlanc, Acting Chief of the FCC’s Enforcement Bureau, in a statement. “When a consumer tells a company to stop calling or texting with promotional pitches, that request must be honored. Today’s settlement leaves no question that protecting consumer privacy is a top enforcement priority.”

In addition to forking over the cash, Sprint has agreed to implement a two-year plan to ensure compliance with FCC requirements protecting consumer privacy and preventing consumers from receiving unwanted telemarketing calls.

This latest action follows a 2011 settlement with Sprint arising from yet more complaints that Sprint made telemarketing calls to consumers who had requested to be placed on the company’s Do-Not-Call list.

Sprint has committed to investing “significant capital” to improve oversight and compliance, and the company claims to have conducted a thorough review of Do-Not-Call systems and procedures, Reuters reports.