How to make activation number work?

My phone was stolen so I now have a new phone and reordered a sim card. I went to activate the sim card but realized it was not the right link because this one was to get a new phone number when what I want is to replace and deactivate the stolen sim card and keep my phone number. So I quit that page after having used my activation number but not actually activating my card. Except that when I go to the right link to switch my number to a new sim acrd, it now says that my activation number is attributed to another member, probably because I used it already, but didn't actually get to the end of the activation.
How do I fix this? I want my activation number to work or to get a new one for the new sim card I received to replace the stolen sim card.

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