This is not a cookies/cache issue. I had this happen when I ordered the white iPhone 4, there was a problem during the order process, I got kicked out the Apple Store on-line, then when I went back in, I got the "order already exists" message. Over and over and over.
No one could fix the issue. Called Apple, went into a retail store, stood there with a rep for about 1 hour with no success - even the rep called Apple and spoke to high-level tech support. No go.
The only way I could resolve the issue was to buy the white iPhone at an AT&T store up the street from the Apple store. Luckily, they had them in stock and I was in and out of there in about 20 minutes.
No one could fix the issue. Called Apple, went into a retail store, stood there with a rep for about 1 hour with no success - even the rep called Apple and spoke to high-level tech support. No go.
The only way I could resolve the issue was to buy the white iPhone at an AT&T store up the street from the Apple store. Luckily, they had them in stock and I was in and out of there in about 20 minutes.