How Do I get an Answer to get my serial numbers back from 2 system that have been reset?

I have had 2 system go down on me and I have lost the serial numbers for both copies of Nero.

I have made a DVD for version of Nero Multimedia 10 and copied the 2014 version to another hard drive which I still have but no serial numbers for either one.
I think I have found the serial number for Nero Multimedia 10 but I know that I bought 2014 somewhere between Aug 2014 and Jan 2015 and I am unable to find the the receipt emails or the paypal transaction.

I have contacted Tech support and received nothing in responce.

Any Help would greatly be appreciated.
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