Thanks for all the replies.
I wrote a further letter to the Dept of Public Expenditure and Reform (what a ridiculous name btw), outlining in quite some detail how I stand to lose quite a bit of money by being tied to this scheme. I even demonstrated that the value of my pension levy payments will surpass the value of the pension being held for me within my five-year contract. I had excel sheets and everything. I asked them what would happen if I get another five year contract or if I stay here for the rest of my career. The response this time was very short and amounted to very little more than 'PFO'.
Orga - thanks for the advice, I may do that. It's just that it's the money I'm paying on pension levy that i'd like to put into a private pension.
The attractive terms of my current employment over the previous pensionable one is the higher salary. But taking a hit of 260 euro a month eats into that.
I've been letter-writing for two years now. Might have to concede defeat on this one.