As asked i started to report Spam but now every time there is a post on that thread i am getting notifications, not just a few but my phone has never stopped buzzing.
How can i stop this either by turning off notifications or at the point i report Spam in future , cannot find any options in My Account.
Look up at the top of this page, above the first post in the thread. There will be a picture of a tiny pair of binoculars. It will either say Watch Thread or Don't Watch Thread. That's where you turn off notifications.