Hi,
I just wanted to chime in and say that if you live in North America and you're able to call in tomorrow morning to get this issue resolved, I highly recommend doing so: (310) 846-0345
Make sure that you have an open ticket on your issue.
This is the form you need to fill out to create your ticket.
To make sure that your ticket registered and is open,
log in to this website. Your ticket history will be on the right hand side. A correct ticket for the issue of 2 separate accounts needing to be merged should have a title that looks like this:
[Support Form] Service Account Incorrectly Registered
The phone lines open at 9am. Start dialing at 8:59am and be prepared to wait on hold for up to 3 hours, possibly more. In my experience I waited for 2.5 hours.
You're going to need to tell the agent things like your ticket number, Square ID, birthday and even your product key number too.
I know not everyone can call, but if you're able I seriously recommend it as opposed to the live chat.