<sod >An investigation by the ICO found hackers gained access to the database of details which TalkTalkÂ had from its takeover of rival firmÂ Tiscali via vulnerable web pages which it had not spotted. TalkTalk also avoided  "warnings" prior to the hack which should have alerted the firm to the problems with its software and data storage< eod>< sod > It did not and we have taken action," she added. An investigation by the ICO found hackers gained access to the database of details which TalkTalk had from its takeover of rival firm Tiscali via vulnerable web pages which it had not spotted. TalkTalk also avoided "two warnings" prior to the hack which should have alerted the firm to the problems with its software and data storage.< eod>