[Effendi]

I think there are registration problems, you can try to call *124*155#, it's free also outside Italy, but I fear it will be hard if you don't speak Italian.

Buying an Italian sim on eBay almost always give these problems. Buying it in Italy in a shop shouldn't, if the shop-assistant knows what to do with foreign people (most don't).

If tel number and CF don't correspont there's NO WAY to register on 155.it. Probably the dealer had problems with your "homemade" CF and used another, without telling you. Of course you cannot know this CF and so cannot register to 155.it.

The only way is to call *124*155# but also if you speak perfect Italian I'm not sure they will tell you the CF used for the registration.

You can tell me your numbers and details on PM, then I can try to contact the customer service, but since I'm not you they won't ever give me any information, due to privacy law. But I know a person who works at 155, hoping he's not on holidays, so I can ask.