nanang_2 on MY REGISTED PRODUCT LOST IN ACCOUNT

I ALREADY BUY AND GOT THE SERIAL KEY
WHEN I TRY TO INSTALL BACK WITH THE KEY IT SAY IT REGISTERED TO OTHER ACCOUNT
MY ACCOUNT ONLY THIS HOW COME IT SAID REGISTERED TO OTHER ACCOUNT ?
MY SERIAL KEY IS EZ20-4E3A-ABKR-BBYA-A98X
PLEASE HELP ME .....
MY REGISTERED PRODUCT IN THIS ACCOUNT ALSO LOST
MY RECENT ORDER ALSO LOST, I ALREADY BUY THE EZ DRUMMER