Upon contacting Samsung to complain they informed me that it was my fault that they were appearing due to applications that I have installed. The ads all originated from applications that were pre-installed that were locked and un-removable.
In the end I had to work out how to block the TV from contacting Samsung's ad servers at the DNS level, although now a PiHole is an easier solution to this problem.
https://gist.github.com/peteryates/b44b70d19ccd52f62d66cdd4b...