Internet users claim they have been plagued by slow connection speeds, intermittent faults and screen freezes.
BT subscribers have complained about the internet service, adding that Vision boxes, which allow customers to watch freeview channels, as well as connect to the internet to watch programmes, are constantly freezing.
“It is so annoying because you will have a couple of good days and then the problems return again,” said Joyce Jenkins, from Kings Road in Glemsford.
“We have had a crackly phone line, the internet doesn’t work for hours every day and we’ve had difficulties with iPlayer.”
Mrs Jenkins said she had reported the issues to BT and believed there had been an increase in problems since August.
“I feel quite strongly that I should not have to pay a cancellation charge if I was to get out of this as the service has not been what it should be,” she added.
Ron Street, who lives with his wife Jacqueline in Landsdown Road, Sudbury, said they had encountered similar issues.
“The system is not 100 per cent and it is very frustrating,” he said. “The iPlayer hardly works and always needs rebooting. I am not very happy about it.”
Internet problems have persisted in the area for a number of years. Last year, Suffolk County Council signed a £40million contract to deliver better broadband for all by the end of 2015. The roll-out would mean every property in the county would have speeds of at least 2Mbps.
A spokesman for BT said: “We are sorry to hear that these customers have had problems. We have looked into both of these cases and one customer indicated that they had no current problems and other had a fault with their phone line which an engineer has been set out to.”
The county council has confirmed work on its better broadband for Suffolk programme started ahead of schedule and BT engineers have begun carrying out surveys in some locations.
The aim of the early roll-out is to connect more than 1,500 business and residential properties during the autumn. Engineers have already begun ordering cabinets which are likely to be sited on the edge of areas currently benefitting from fibre optic broadband and in more rural locations.