Confused and tired of Lies

For the last week I have been trying to get a straight answer to what I think would be an easy question.  So far I have recieved 5 different answers and even spoke to the loyalty team.  I have a unlimited cell plan with currently 2 phones and have just signed up with Directv NOW.  Where I live I have no line of sight for Directv Dish and can not get U-verse or Internet by AT&T.  With tha being said I went over my data streaming Directv NOW and was trying to figure out how to do this.  AT&T told me since I have unlimited data and Directv Now is partnered with AT&T that I can mirror my cell to the tv to watch TV..... that's great I thought.... untill I got text notifications, emails, Facebook....etc etc etc.... so then I started looking into other options.   Came up with a wireless hotspot to stream through my wifi tablet (no cell service for tablet).  Chatted with AT&T using the chat to see if this is possible.  Was told I could add it to my account at $20 a month and stream all the Directv NOW I wanted since it would not count against any data because those mobile hotspots are limited to 50GB but Directv Now would use none of that since its Sponsered Data..... I was like that's perfect.  Went to signed up the the contract said it would be $50 a month, I asked Steve in chat what happened to the $20 a month he said we can change that later.  Sorry AT&T, too many times have I called and told something would change and it never did, so I said I would do it through a local store.  I went to a local store, and the salesperson their said, Steve on chat was lieing to me.  The plan would be $50 a month and would be limited to 50gb of data because the mobile hotspot can not differentiate between Directv Now or regular web surfing.  Well I figured since the data goes through the AT&T towers the salesman was incorrect.  So I come home and make another call to AT&T to see what's up with pricing and was told I could get the mobile hotspot for $50 a month and that the data going through it was all charged the same.  So now I asked to talk to the loyalty department, got a hold of Carlos there, he says I can add mobile hotspot to my plan and data would not be charged useing streaming through the mobile hotspot but had no idea what the plans monthly fee would be since they no longer sell mobile hotspots.  He was going to document the pricing on my account, which for other items has never been documented that anyone can see.  So I get on chat the next day to find out about the plan and to see if Carlos has it documented.  Well Steve on chat tells me that the plan would be $50 a month limited to 50gb no matter what data I used, then I ask him if he saw any notes on my account from the loyalty department..... he came back with you talked to the loyalty department?  I said yes and I wanna confirm what notes and pricing is available to me.  He came back with well what did he say?  I said I just want to confirm what he wrote because of the course of a week I have been told numerous prices etc and things about data.... but of course nothing I can get in writing to take to a store.  He said well what do I think it should be.   So I said I was looking for $20 a month bill and unlimited streaming through the mobile hotspot.   He said I can confirm that... which I saved in a screen shot.  Now my question is will this be honored or what?  I keep hearing how at&t reps in chat say one thing just to please customers but that's not the deal when you get the bill..