I was with Zen for about 7 years and the service went from bad to worse over that time, price hikes, I was paying £67.50 for 2 landline phones and ADSL broadband on one line.
Endless outages, Poor service, diabolical tech support, nothing but a bunch on amateurs who made endless excuses for their poor service like blaming my router and computer, both of which were top spec and brand new.
I was glad to migrate away from them after the abuse I suffered by email from both their staff and CEO for daring to complain.
I am now taking them over the coals with the Ombudsman and I would never ever go near them again.
My advice, steer well clear, they will never give you value for money and they are downright arrogant and rude.
They compromised my business and I lost a lot of money as a result.
Value for money - ZERO stars.
Support - ZERO stars.
Speed - ZERO stars. (Dial up was faster in the 1990's!)
Services - ZERO stars.
Utter disgrace.