Very confusing internet problem??? help!

[bigshot316]

About 3 months ago I subscribed to the Post Offices new broadband system, and literally plugged it in and off I went.
It has been connecting fine, often at around 6.5, which is great for what I need (mainly watching online TV, sports, facebook and news) until 2 days ago.
The connection was suddenly lost, and then it had real difficulties reconnecting and when it did, this only lasted a couple of minutes.
I left it and tried again yesterday. After a few attempts it connected at 6.4 and I thought everything was fine.
However, my internet is running like dial up!!!
I simply cannot watch any videos as they pause every 3 seconds, and simple web pages take a few moments to load, with text first and then images etc. following.
I called The Post Office tech help, and unfortunately the girl there sounded both foreign and clueless.
She said she ran some line tests and it was fine.
I have reset the modem, used AVG and Spybot S&D, I have cleared all uneccesary files off my hard drive, I have even tried a system restore to before it stopped, all to no avail.
When I run a speed test, it hardly registers, and when I try and run VEOH TV, it cannot even detect that I am connected to the internet.
Does anybody have any ideas where I go from here? I am frustrated as i don't understand why it is saying on my connection that it is at 6.5, my ISP say the same, but it actually is running at nothing hardly!
I would appreciate any help you guys could offer me.
I'm running XP btw.

 

[Jason.369]

Ring again and see what they say? ...if the noOb tech assistant isn't much use ask for someone higher. The more of a deal you make the more they'll listen.
If they still insist there's nothing wrong on their behalf and things don't improve much after a week or two then consider changing your Internet Service Provider (ISP).

It's not a fault with your PC, loads of people have such issues; they come and go ...some take weeks to go which is the problem (that I've personally experienced).