I have exactly the same problem under the new system.
A LIve Chat contact simply said that I needed to join the Community as he didn't have an answer - obliquely suggesting that unless enough people complained Talktalk wouldn't deal with it!
Sounds a bit like an Apple response once uon a time...
I am waiting up to 24 hours for forwarded emails to arrive -I have to check regularly - whereas it worked fine before the upgrade. Shame Talktalk don't want to know, but I'll go elsewhere soon as they don't seem to want to help.