To speak to an Adobe human:
To try to find your serial number:
There is no serial number for Photoshop CC subscription, you just need to open the software and click on License this software then sign in to activate the software.
In case it's asking for a serial number then try this: http://helpx.adobe.com/creative-cloud/kb/ccm-prompt-serial-number.html
There is no CC registered to the Adobe Id that you have for forum. Have you any other Adobe ID? in case you have Photoshop CC & it is asking for serial number then please refer to Creative Cloud applications ask for serial number