Transfer Fizz number to new SIM card, also from Fizz. Is this possible?

Hello! I've had an account with Fizz for almost a year now, but lost my SIM card recently. I ordered a new one and wanted to activate it on the existing plan, with the same phone number. When I started the activation I was logged in, but didn't realize I had to go through My Plan to keep the number. I realized my mistake soon and didn't go through with the activation, but upon trying again from My Plan (on the same, and on a different device) I got an error message saying the SIM is already active for a different user (although I was logged in on the first attempt as well). Is there any way to reset/deactivate the SIM card or transfer the old Fizz number to it? (I tried looking for the number but I got an error here as well, saying this number is already on Fizz and cannot be transferred). If possible, I'd like to avoid going to Support, I've had only bad experiences with them... any idea what I could try? Your advice is much appreciated, thank you!