If you have poor broadband from BT, problems with connecting, low speed. Complain at your peril! If you tackle the 'intercontinental helpers' they may request a monitor to be placed on your telephone line. If it discovers that the line cannot deal with the specified speeds, they will place a cease order on the line and you will no longer be able to get broadband from BT or any other ISP.
The answer ( thank you Gerald) is mobile broadband, not quite so cheap but an effective alternative.
Beware you have been warned! don't complain! I know from experience. Jerry