If not listed as ICB members they are not using it.
If you go onto Irish Credit Bureau site you can for e6 get your ICB report.
Looks like you met an unmannerly (twit).
No point in the hassle of FSO , too much paper!
For your own (sanity) don,t get into phone calls ,put everything into a note , keep a copy and await response.By putting things in writing , you get time to cool, and they are forced to respond and importantly you hold a paper trail.
In short God bless , snail mail!