That's completely normal tho across all ISPs, isn't it? Certainly has been my experience over the years.I wouldn't recommend them as I ended up with a game of ping pong going between them and openreach when my connection kept dropping and it went nowhere until I moved to another ISP and everything is as stable as it was before that whole debacle started.
ISP blames OR. OR blames ISP. OR sends their least qualified new recruit who doesn't have a hope in hell of finding any fault and tells you to your face he's only allowed to look for 30 mins max per call, then he has to leave the site and mark "no fault found".
Then ISP attempts to charge £50 for no fault found, despite the line being dead/dying, and around and around we go!
This is the state of the UK telecoms market, not ISP specific.