I fell for the $25 discount on Fios with existing Wireless account and got Fios. Unfortunately, since my address wasn't changed in my profile, the order accidentally went on my old address, so I immediately canceled the order (within minutes). Unfortunately, I had already linked wireless+ Fios. Now when I ordered Fios on my correct address, I am unable to link Wireless+ Fios since the old canceled account is already linked. I have spent countless hours with agents from practically all departments and nationalities, however no resolution yet. Please have an agent submit an incident report to unmerge my account
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I'm hoping you got this solved for now and posting for posterity.
Ultimately I had to convince the Verizon Mobile agent to "unregister my mobile account from online access completely". Then, confirmed that I couldn't log on using my phone number and then I was able to add it to my new Fios account.
The longer story is that hours of chatting with several agents for a total of 4 hours lead nowhere. I called and was bounced from Fios to Mobile to Tech and the cycle continued. Finally when the last mobile agent was about to bounce me back to Fios I had asked her to just "unregister my phone account from everything". I don't know why it worked this time as opposed to the other agents that said they couldn't unregister my phone account but it did.