When I resigned from SAS Ireland, I sent an email to the DFO. His answer was quite surprising: "I can't acknowledge your resignation, we don't work for the same company"....
It appears that SAS gave the keys of SAS Ireland to Parc, and it's out of control. You receive threatening emails from some obscure frustrated Parc secretary, the roster is a mess, and even the 5/4 doesn't work as usually you get an early flight on day 1 and a late one on day 5. The attitude of Parc makes Ryanair look like a bunch of cute Teletubbies. I've been in many airlines, but I never had to deal with people that rude. This, combined to the lowest T/Cs on the market makes this outfit suitable only if you are desperate or a masochist.
I had to get a lawyer to recuperate my last month salary, even though I left according to the contract, with the proper notice given and my company material given back.