How do I activate my SIM card after it says "activated by another user"?

I am trying to activate a SIM card for my aunt with her account. I had activated the card, but then my laptop died and when it was recharged, I logged back in to the Fizz account to continue the activation. However, it now tells me that the SIM card has been activated by another user even though I had originally activated it using my aunts account. Is there a way to fix this?


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