SIM card Switches and number problems

I recently got back from a trip to Buenos Aires. While I was there, I switched my iPhone 8 SIM card from my Verizon one to a Movistar SIM card. I got an Argentine number and everything. Eventually, I was packing to come back and found that my other Verizon SIM card had been thrown away. When I got back to the States, I immediately ordered a new Verizon SIM card. I switched the SIM card, but my Argentine number is still in my phone and it won't let me delete it. Additionally, I can't seem to add my old number back onto the phone either. I have data and everything else, I just basically have a phone without a phone number. I called Verizon and got another SIM card sent to me, but the same thing happened with the second SIM card too. I tried turning on and off the phone, turning on and off IMessage and FaceTime. Please help! Thank you!