I want to get away from TalkTalk altogether so started with my mobile. What a surprise, I was told "DUE TO TECHNICAL PROBLEMS WE ARE UNABLE TO ISSUE PAC CODES" What an absolute joke this company is !!!!!
I was told that yesterday as well and today they cut me off!
I had same problem but working now, they just gave me one via live chat, make sure you are logged into your account to make it simpler.