Incorrect upgrade

On the 27th February 2026 I called to increase my data on my Internet data contract. That went well. I was offered an upgrade on my other contract which has two numbers by Annette. I was promised a headset and a microphone. I received two headsets no accessories. I was also promised a lower bill. I received a heavy bill. When I questioned the bill I was told that a different number had been upgraded. I could upgrade my number on 1st April 2026. My question is why was the incorrect number upgraded? What will happen on my account if I upgrade my original number? Where are my accessories? Other headphones do not fit the new phone.