With all of the announcements of extra content such as Magazines and allowing purchases of movies and TV series and also devices, it looks like Google now has an option for callback support on purchases from the Google Play store. Offering support for purchases of Android Apps, Books, Devices, Magazines, Movies and TV and intriguingly enough ‘Music’, you simply enter your details into the support form including your contact details and a description of the issue and Google will call you back to hopefully resolve the issues. There is also a support number at the bottom of the Google Play store when you order your Nexus 7 so you can update any details on your order :
Source: Google Support.
