From whom did you purchased Premiere Elements? Can we presume that you are referring to Premiere Elements 13, the latest version?
If you purchased from Adobe, Adobe needs to sort out the details of your purchase. This is not Adobe, rather user to user.
I suggest that you make contact with Adobe Chat Orders. Please click on the following link
Membership, Account, Payment
Payments, Invoices, Orders
If the link does not hold its set, then you will need to navigate to the Chat Panel using the above titles as guides.
There is also an Adobe document on the matter which you might want to check out also.