I ordered A Samsung S25 galaxy on July 1st.

It came in on July 3rd and I activated it with Xfinity mobile chat. But the problem is they were supposed to turn off my S23 Ultra. So, I could factory reset it so I could ship it back for the trade-in. They told me it is off, but I can still use my same pin to unlock it, and I am still getting messages on all my Apps with both phones and the S23 is overriding my S25 so I'm not getting messages on it now. I have been trying everything to figure it out. the S23 is not responding to the factory reset. So please if anyone has any suggestions or possibly knows what to do let me know. Thank you