Does the "Returned home?" section here help at all?
https://community.48.ie/t5/The-Knowledgebase/The-Roaming-Troubleshooting-Guide/ta-p/52179
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
While you're here, check out our "Featured Topics" below.
Our Troubleshooting Guide and Knowledgebase contain help and support articles and popular questions to help you as a 48 customer.