Why have I lost access to my data, calls, and text when I reactivated my Fizz SIM card?

We ordered a replacement Fizz sim for one we lost. We have received it and activated it but nothing is working - no phone, no data, no text. We tried reentering the activation code but it advises another user has that code. I assume we are the other user. Can you provide other options to resolve the issue. We have rebooted the phone with no success

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