Roaldan

I'm not sure what your plan speeds are. I see from your test data that you had a test point around 25 Mbps, and the rest of your points are only about 1/10 of that. That's a sign of a problem. I don't know what they mean by exchange congestion. One of your slow points was at around 5 AM, so there shouldn't have been any congestion.
 
i suggest you keep calling them until they get it corrected. Stay patient, polite, but be persistent.