Ha ha - complain!!!! My dealer, and by the sounds of it, every dealer in this country has had enough trouble even knowing what a Connect Form looks like, let alone have one ready for PDI.
I think, however, that this is something the customer is partly responsible for. After all, you need to buy a SIM for the phone number to give to Connect. I doubt very much Fiat will ask for a SIM when you pay your deposit, for example, or a few days before PDI. You only tend to buy this, surely, once car already delivered!
And when I have spoken to the guys and galls in Milan, even they say it is USUALLY the customer that sets all this up.
At the end of the day, FIAT UK is totally at fault for not even understanding what it is selling.
Stuart