Zen Internet has been named a Which? Recommended Provider for Broadband Services with a five-star rating for ease of set-up, reliability, clarity of bills, ease of contacting, customer service and technical support.
Which? questioned 3,717 broadband customers about their experiences to identify the best ISP providers in the UK.
The customer score (as a percentage) is based on overall score and the likelihood of users to recommend an ISP to a friend.
Andrew Fryatt, MD of Zen's Small Business & Residential Division, said: "This acknowledges the commitment of the entire team at Zen, especially our Technical Support and Customer Services team who go above and beyond for customers every day."
Which? said: "Zen Internet came top in our survey with the highest customer score of any provider - 98% of customers surveyed said they were satisfied with the service, and 95% would recommend it to a friend."