Who I have the same questioned this topic

I chatted customer support because an upgrade link on our account page was broken.  Started great, was upgrading 5 phones to iPhone12 minis.  Last message from my rep was “That would be great! Let me first process the upgrade on your lines. “. That was followed by a text notification saying I owed $422 today with a new monthly bill of $605!  That’s 3 times what it should be.  That was 45 minutes ago.  I sit here asking for some sign of life every 10 minutes or so... if I close the window, the chat record disappears, right?