I phoned them on this number when I had tickets stolen (it's their customer service): 01-6486060
Once I got through they re-sent me some tickets without much hassle. Well I say without much hassle but... On the first phone call I was told that I needed a note from the Gardaí to say that I'd reported the theft but the cops had a right laugh when I asked for that. So I phoned TM back and the fella I spoke to on the second occassion said I didn't need the note and just sent me new tickets, without hassle
Also , this number is on their website for customer service: Republic of Ireland - 0818 903001