Unfortunately I've got the same problem with Atlas Telecom (Atlas Business Services). They transferred my telephone, but not my broadband (my good fortune) in May and I've been in dispute with them ever since. On 5 occasions I've tried to transfer my telephone back to BT, but it's been cancelled by Atlas Telecom (Atlas Business Services) each time. I have to keep cancelling the direct debit as they continually try to re-install it - for an amount much larger than initially agreed. They refuse to acknowledge my letter of complaint and I even had a call yesterday from one of their account monkeys, pretending to be a bailiff - until I pointed out that I recognised his voice from earlier calls. What a bunch of scammers. They are aggressive, threatening and arrogant on the phone - and probably bully a lot of people into paying them.
However, with the ombudsman receiving a lot of complaints, hopefully they won't last long. Surprisingly, this is the only website found by Google when I searched for complaints against Atlas Business Services (Atlas Telecom). Amazing, considering how distressful many people's experiences will have been when dealing with Atlas Telecom (Atlas Business Services).
Posting complaints about Atlas Telecom (Atlas Business Services) on various forums by members of this forum would help. Always use the full name when referring to Atlas Telecom (Atlas Business Services) as this helps with google searches on the company - especially when used repeatedly in the same post. As pointed out by a colleague, when searching on Google for negative comments on companies, he always types the company name and then "Shit" - so prospective customers of Atlas Business Services Shit should take heed.