@Adam2002, Hi there, that's a strange one! The reason being is that "hotspot" is not a 3 product or service but a feature on your phone. We don't have the ability to influence or support it ! However, data roaming on the other hand is something we can check. Do you have any data left in your allowance? Are you able to connect to data when you are not hotspotting?
I've moved your post to our Prepay section, if you aren't prepay, let me know 👍