Hmm, maybe your ISP is filtering some ports; this could be a reason for your slow speeds. Another option could be a proxy-cache or something related.
Some time ago, here in Spain, the main ISP (Terra-Telefónica) put a nasty proxy-cache. The main objective was (in words of the the ISP) to "accelerate the rendering time of recently accesed web sites in order to give the customers a better service". In other words: save money and bandwith.
It was a nightmare: during some time the download speeds were too slow, some websites showed an ancient cached version of its contents, some programs started to malfunction, and so on ...
Have you received any answer from your ISP?.
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