I'm sorry to hear that. We've been with Zen for many years and through multiple addresses, and the only technical issues I can recall originated with Openreach

I'm sorry to hear that. We've been with Zen for many years and through multiple addresses, and the only technical issues I can recall originated with Openreach rather than Zen and got escalated promptly by the Zen support people. Never had a bandwidth problem, and right now we're routinely getting close to the top speeds available with FTTC, even at "busy" times and with the coronavirus disruption. We did have a bit of hassle getting connected the last time we moved, but again I'm not sure whether that was really Zen's fault, because we ended up getting a BT engineer sent out to install some new hardware as well. It's true that Zen are relatively expensive, though, and their lack of 24/7 support is still well below par. A&A would be the obvious alternative to consider if we were moving again or decided to change ISP for some reason.