Can I please get some assistance?

I received an email that said because my device is paid off I am eligible for a new one. Went to the site and started the process of an upgrade but by the time I got to check out, it was going to cost me 3x what I pay now. Then suddenly a live chat window appears and says they are a live agent can they help. 

I explain what I am doing and they ask me for the last 4 of my specific credit card! Ya, right. Like I'm gonna give that info. Then they say give them the code they just texted me. Again, ya right! In this day and age, I'm not going to give any personal info to anyone, especially on a chat! But not only that, when I get codes from Xfinity it says WE WILL NEVER ASK FOR THIS CODE. So why am I being asked for this info? The chat person said if I don't provide the info they will have to end the chat. If that is the only way to receive assistance via chat then Xfinity really needs to rethink their policies and procedures.

Anyway, back to my original issue. I have been an Xfinity customer since 2015, 11 years! And you can't do me a better deal for an upgraded phone than over $100/mo?!  If that's the case, I am cancelling all services and going elsewhere! CAN SOMEONE PLEASE CONTACT ME VIA WHATEVER METHOD I WONT BE REQUIRED TO PROVIDE CC #'S, BANK ACCT, SS#, OR MY FIRST BORN JUST TO GET SOME  ASSISTANCE. PLEASE AND THANK YOU KINDLY!  Sincerely, a VERY not happy customer.