The reason that TalkTalk is mentioned in the message text is that your ISP uses TalkTalk equipment in the exchange. For more information on this, Google Local Loop Unbunding Shared Metallic Path Facilities. It's got nothing to do with TalkTalk acquiring your internet provider.
I'm bound to warn you that the technicalities of the system will lead to some considerable head scratching unless you've got a reasonable knowledge of telecommunications.
However, here's another way of looking at it. There are hundreds if not thousands of ISP's in the UK alone. Now each time you sign up to an ISP, they will tell you about the need to modify or add their own equipment to your local exchange. Just stop and think about that for a moment. How would BT cope with hundreds or thousands of ISP engineers knocking the door of your local exchange with their own box of gubbins? They would neither allow it or cope with it as they couldn't get on with their own work. There are also the security aspect to consider.
So what happens? All equipment in the exchanges belongs to either BT or one of around half a dozen major internet providers. These include SKY, Talktalk, EE etc. You are getting the message Dusty Bin because your ISP rents out TalkTalk equipment at the exchange and is routed via ISP servers. Simples!