If the APN field of the APN settings is not 48months.liffeytelecom.com can you edit it and change it to that and see if that makes any difference? If none of that helps then you'll probably have to contact 48 support. See the link in my signature below or email them at firstname.lastname@example.org
Hope this helps.
I am not a 48 employee - if you need to contact 48 support then please click here - if the Chat Now option does not appear on that page then keep trying until it does.