international invoices

I have to send an international invoice to an italian buyer and it's not working. I got the message that : invoices can't be sent for Ebay international shipping orders. I tried to speak with the Ebay staf and incredible they are not able to give me a solution.  Also some buyers sent me screen captures in wich my shipping charges are 10 times more high than in my listings.  Are anyone able to help me with this

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(If a Cdn seller uses letter service to ship to the hub they have little in the way of protection because it is untracked.)

 

I have sent off my first eIS shipment with domestic Lettermail shipping to Mississauga. 
It was a low value item and I have all my fingers and toes crossed.