Had to go in the opposite direction and cancel an Eir contract and get a phone line turned off recently for a now vacant house. Getting through to customer service was easy, they answered speedily and were very good and nice on the phone. Problem was, they are a "catch and dispatch" operation, so whilst they fielded the call, raised the case and forwarded it on to the relevant dept or team, that actual completion of the task, to terminate the line, took over 3 weeks.
So they've fixed the first part of their problem, their call centre, but there overall service is still pants.