I would like to merge two accounts together

The short answer, unfortunately, is no. 

As much for a mobile plan as for an Internet plan, our systems do not allow the transfer from one account to another. It is also impossible to group several accounts together. These are features we are working on, but for now, it is impossible. 

The only alternative is to unsubscribe from the plan in the account you want to leave and resubscribe to a new plan from the new account. And that is why we are working hard to address this situation as soon as possible.