@markwatson have spoken to the guards regarding this at length, unless you can get categoric proof that proves mens rea ie that they did it on purpose they can't do anything. As always, when it comes to law it isn't what happened, but what you can prove happened and this is the difficulty here, short of a whistle blower....
It's incredibly frustrating, but all the more reason that pressure needs to be put on through public representative and bodies such as the FSO and CB while they don't have the power we would like them to have, if more pressure is put onto them possibly something might eventually come of it. Pressure through the media is also good too, but it can't be the same people telling the same stories each time which has certainly been a difficulty up to now. I have also kept writing to Ulster Bank despite more Pfos than I can count but I know they are frustrated with the volume of letters from me and that just makes me write more ;-)