Credit reporting agency Experian announced Thursday that hackers broke into its systems and acquired the records of 15 million T-Mobile carriers.

Anyone who applied for a regular T-Mobile USA postpaid plan between Sept. 1, 2013 and Sept. 16, 2015 might be affected, reported the Associated Press. T-Mobile uses Experian to check the credit of its customers.

However, T-Mobile is now incensed, and the pair's relationship is in jeopardy.

"Obviously I am incredibly angry about this data breach and we will institute a thorough review of our relationship with Experian," T-Mobile CEO John Legere said in a public statement. "I take our customer and prospective customer privacy VERY seriously."

Experian noted that it contacted authorities immediately after discovering the hack and that "there is no evidence to-date that the data has been used inappropriately."

Both companies assured its customers that payment cards and banking information was not affected, according to CNN.

In order to make it up to customers, Experian is offering a somewhat disconcerting deal: those affected by the hack may apply for two years of free credit monitoring and identity protection.

The problem? Doing so would require users to hand over more money - and information - to the company and confirm its accuracy. The very same group who couldn't protect its clients' sensitive data wants even more sensitive data.