Duplicate Apple ID/Email Address

First, sberman, thanks much for the reply. I was pretty sure that I was the proud owner of all three email versions (@mac, @me & @icloud). Thanks to reading the link that you cited, I now know that I am. However, that is not really the problem that I am trying to solve. My problem is that someone in England is either correctly or incorrectly using my email address (the @icloud version of my address). If correctly, then Apple has mistakenly issued a duplicate address. If incorrectly, then possibly a typo or fraud is the blame. That is why I have contacted the stores in England that sent me the digital receipts. And it is also why I would like to know how to contact Apple about the issue. Sorry that I was not more clear. Does anyone know what Apple email address or phone number would be best to contact? Thanks