Just a heads up I have been showing slow speeds when using Speedtest.net for the last few days. Try http://www.dslreports.com/speedtest as that seems to work as expected. I don’t know if it’s something to do with Speedtest.net or a windows update but I just can’t max out my connection using it like I used too. Yet I am downloading at like 40MB/s on steam when downloading games on my 350mbps so there really is no speed issue.
Then just get them to undo the install using the speed guarantee - or leave if they can't fix it. The guarantee on 500 if I remember rightly is something like 458 or 498 That's a ballsy move as someone was told "good luck getting them to do anything as it's "up to" on another thread - but then thing is it's no longer up to that's the speed you will get or you can leave.