Cash credit on your account is irrelevant here.
Do you have an active membership?
Does this post help at all?
https://community.48.ie/t5/Internet/How-to-fix-no-network-service-when-roaming/td-p/56352
If not then you'll have to contact 48 support.
See the link in my signature below or email them at support@48months.zendesk.com
