Ring up Plus net on 0845 140 6002 and request for a MAC code. When they ask you why say that it is only £7.49 on TalkTalk (ugh)!
They will offer you Plus net broadband with 60gb allowance and unlimited calls for just £7.24 plus £11.99 line rental. Not only that, they will fix the price for 12 months :)
So in summary, you will get the same package as before but with TalkTalk's cheap prices!