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Dedicated Advanced Technical Support Team Tier 3 please read this.!!

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Dedicated Advanced Technical Support Team Tier 3 please read this.!!

back story; my internet was horribly unstable, so I changed my modem to old modem, to see if it's modem's problem.

Just to be clear: current modem : SB6141 and  the old modem : SB6121

 

and I activated SB6121 on xfinity.com/activate,  then I wanted to go back to my SB6141 again, but I couldn't access xfinity.com/activate with SB6141.

 

I had a live chat session to activate SB6141, he told me there's an error.  SB6141 is already in use, but doesn't show in account. Customer call service told me same thing. I was waiting 40mins+ for Advanced team on the phone, but couldn't reach them. 

 

Is this because I deactivated my SB6141 4 hours ago? Do I need to wait more?