Dealing w/google sometimes can be a bit of a pain - but since you have a 2nd channel - I'd contact them via the help section (upper right corner) and provide as much detail as possible.
They can actually see things on the backend (i.e., who logged into your account, where they logged in from, type of computer system, etc, etc) - and if it matches (i.e., both 1st/2nd account are obviously yours) - they may be able to assist. But provide as much detail/proof/etc as you can that both channels are yours.
Good luck.