Don't expect anything to change. I've been going through the same torment with Orange for the last year, complained several times to the ISPA - all to no avail.
If only you knew. I've must have been through the Orange customer service procedure about twenty times by now. Each time they 'resolve' my problem by giving me about 1MB for a week or so (even though ...
If you're feeling ignored by Orange as I am, another way to get their attention (in addition to this great site of course) might be GetSatisfaction.com.
The fact that sweeperdog is still here even after switching ISPs speaks volumes. Not only is switching to Orange a bad idea, but you'll be so enraged that they'll turn you into a militant anti-Orange ...