Ported number to xfinity from verizon, but phone still connects to old verizon voicemail (iphone 13 pro)

Good afternoon. I have seen others have a similar problem while searching google for an answer, but can't seem to find how it was fixed. I recently switched to xfinity mobile from verizon, but whenever I dial the voicemail it still takes me to verizon's voicemail system. This has also lead to me not being able to access any of the visual voicemail features, or being able to set up or change my pin for the voicemail in the settings. If I change any settings or the pin while connected to the voicemail, it leads to text messages from verizon's security informing me of the changes, so I am certain it is my old verizon voicemail. I have tried all the common network resets and such to no avail, as well as spent time calling xfinity mobile support, but whatever they changed has not fixed it. I've seen it mentioned that a full voicemail reset could be a possible fix, but I don't think that has been tried yet. Thanks for your help.