KT said Tuesday it will waive cancellation fees for customers who wish to terminate their contracts with the mobile carrier, following a major data breach reported in September that led to a series of unauthorized micropayments. On Monday, the government unveiled the results of its investigation into the security breach at KT, concluding that the incident was caused by the mobile carrier's poor management of femtocells, small base stations designed for use in homes or businesses. "KT takes responsibility for the incidents, and we will waive cancellation fees for customers who wish to terminate their mobile service contracts with KT," the company said in a release. KT said users can apply to unsubscribe from Wednesday through Jan. 13, and the policy will also apply to customers who have already canceled their subscriptions since Sept. 1. The mobile carrier said the waiver will be provided in the form of refunds. New KT users who started subscribing after Sept. 1, however, will not be eligible. "We deeply apologize to customers who suffered damage due to the breach," KT Chief Executive Offic