Korea’s two major telecom companies, KT and LG Uplus, continue to grapple with the fallout over hacking incidents and data breaches that triggered customer departures and mounting pressure for tougher sanctions. KT has extended the deadline for customers to apply for early termination fee refunds after complaints that some users were unable to file claims before the previous cutoff on Jan. 31. It announced on Friday that it will accept refund requests until June 30. The company offered to waive early termination fees between Dec. 31 and Jan. 13 and refunds for subscribers who had already canceled their service after Sept. 1. The fee waiver was a follow-up measure to a major hacking incident in September. The breach involved illegal femtocell base stations that intercepted authentication signals to steal subscriber information and make unauthorized small mobile payment charges totaling about 243 million won ($155,700). In the process, the phone numbers and mobile identity data of 22,227 users were compromised. The latest extension applies only to customers who have already left the carr