Welcome to the Community!
Sorry to hear that you are experiencing difficulties in using the roaming service in Italy. I used your Community Details to locate your TPG account and was able to find a match.
Were you able to check through "My Account" if your roaming service is active? Were you able to use the roaming in another country?
I would recommend having a read on this Community article to see if it will resolve the issue: International roaming troubleshooting guide
If the given article does not fix it, I will raise your concern to our Mobile Technical Team for assistance. Since we cannot ring you over the phone, I will have them to contact you via email. Should you have another preferred email aside from the one we have on record, please send it through private message.
Kindly let me know how it goes.
We have raised your concern to our Network Engineers and they have performed a reset on the network. Please do a manual reset or power cycle your phone.
If roaming still does not work, kindly do the following:
Let us know how it goes.