U.K. telecommunications giant TalkTalk announced last week that its October 2015 breach will likely cost it up to 65 million ($94 million) and has led to the loss of 95,000 customers. The company says it lost an estimated 20 million ($29 million) in revenue while its site was down because new customers couldn’t sign up for many types of services. TalkTalk estimates that the free upgrades, plus the breach remediation itself, cost 40 million to 45 million ($58 million to $65 million)”]
Source: https://www.cuinfosecurity.com/blogs/talktalk-took-big-bath-over-breach-p-2058