Lenovo Canada had the same problem last year or so. I fired off an email to the right people, we emailed back and forth a few times, they didn't think there was a problem and couldn't reproduce, I finally setup a test case step by step to pull up someone's invoice, and they fixed it after.
They offered me a free case or battery or laptop accessory as thanks, I never bothered taking them up on it.
I was actually trying to lookup my own invoice from a laptop order I had made... their invoicing system is an utter mess as each component you buy gets separately invoiced as it ships, and I had bought a laptop as a guest or similar.. I knew my invoice number, just not the specific details.. I noticed the url given in the order email had the invoice number in it, and changing the invoice number to the other order gave my invoice.. and then tried a different number and learned that so-and-so had a mouse shipped to their address, etc.
They haven't fixed the invoicing system yet.. I'd much rather be billed for everything at once when it goes to manufacturing, or when it all ships.. Right now you have to go through each line on the order and match it up to the invoice they've sent... calculating the tax and shipping costs for each one.