Slow connection to US, no reponse from mweb team.

For the past 4 months I have been experiencing 1/4 of my line speed when I make a connection to any US server. This does not matter what protocol or service I use. I have tested with other ISP's and I do not have the same issue. I have reported this and Mweb's technical team has yet to provide me any detail on the issue. They fail to contact me until I phone them and try to follow up. We have been customers for over 10 years. But this is taking it too far. I am in IT myself and I would like and understand a detailed explanation. I have been contacted by a different person each time I try and follow up. Each time I need to provide new traces and then that is as far as the communications from Mweb goes. After that I do not hear anything further from them until I have phone again and try to follow up. Mweb has not communicated what is being done about the issue nor what could be the cause or a resolution date. I have to continually follow up. The normal help desk is friendly is the back-end people that are continually refusing to talk to me or provide any feedback.