Unless you have created a port forwarding rule, used UPnP or put a device in the DMZ, this port cannot get through the router in an inbound connection attempt. However, that does not mean that some device of yours is not establishing a session in an outbound direction that would use this port in its return direction.
With so little information to go in in your post, I think it is over to you to investigate further.
The TalkTalk Community has now moved to a peer-to-peer support model. This means that the TalkTalk team will no longer be here to support with queries. Don’t worry, there are plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link here
How to contact TalkTalk Broadband - TalkTalk Help & Support
