AT&T Wireless Defrauded into paying more money Dallas TX

I had a 9GB internet plan which was sufficient for me. I had 3 lines on my family plan. I went in to 34th Street, NYC store to upgrade my phone from XS to 11 Pro. They gave a new phone , I traded in my old one. Well and good.

And then came the manager and advised to switch over to Unlimited Starter plan because that will be less than what I am paying at the moment for the 9GB plan. 

It will be about $25 less. And showed me the charges. Well and good. Also she said it will be effective after the date my current plan ends for the month. Nice. She is tood good.

If something is Too good to be true, it is not. I believed AT&T but seems they are scam artists. The plan amount came to be about $335 which was about $50 MORE than what I was paying currently.  

Also a new activation fee was charged to my plan and now I see a mysterious new # in my plan. I got neither delivery of the sim card nor I was told that they are going to sneak the new number in.

I could use any type of calculator but nothing what they told me happened i.e my bill could never go below my current bill.

WTF.