SAME HERE! 10 days now of exchanging dozens of email with numerous supports!
After purchasing my iMac I tried to redeem my upgrade to Mountain Lion (On 8 August 2012). I received the code. After I entered the code in the REDEEM in APPSTORE, I immediately received the information: This code has already been used. Each code can only be used once.
I have been in contact with all possible Apple support - and STILL have no hel and no solution.
4 days ago I received 2 more emails with a code (in PDF, accessible after entering a special password sent in a separate mail) but it is the SAME code which I received on 8 August.
I checked my account in AppStore - there is no mountain lion in Purchases, nor in updates. My Mac is still in Lion system.
I have been corresponding with numerous people in Itunes support - they cannot help. I contacted my country's support - they cannot help. I contacted uptodatesupport-pl@apple.com - and all I get is an automatic answear how to redeem your code.
I am losing my patience, because all I want to is to get the CORRECT code and have someone help me. I dont want to talk to a machine sending me automatic replies.
The problem is obviously on APPLE's side.
How difficult is this to ADDRESS THE PROBLEM by Apple? There are 30 pages of people with the same problem!
I could get it and buy for 16 euros, but why???? For Apple to pay more money to their INCOMPETENT support?