[inquisitor]

I hope you haven't given any feedback for this transaction. Ask the seller to deliver a Fonic SIM card or to refund your money and if he wants his Lidl SIM sent back to add costs for return shipping + PayPal fees + currency conversion fees. Otherwise leave him a negative feedback and file a complain with PayPal.
If you drop me your eMail address by private message (click my username on the left for this) I think I could help you with this.
Since Vodafone is even more complicated when it comes to switching to their international tariff (and switching back to avoid the monthly fee for the international tariff) and getting the WebSessions activated, you could still try to get a Fonic SIM after arrival. Among other retailers Fonic SIMs are actually sold at Lidl supermarkets like Lidl mobile.