AT&T ATT lied about about upgrade and plan fees Nationwide Internet

I had previously seen a commercial stating they had new rates so I called them and my plan was decreased to 134.00 monthly for 3 phones with 10 gb data (was previously only 4 gb so this was awesome).  My first bill was higher but it went down to 134.00 like they said it would and I was happy.  I decided to upgrade my daughter's phone as a graduation present because that was the only thing she wanted.  When we were there in the store to do the upgrade (I did not do this online, but did it in person at a store), they talked me into upgrading my phone as well... stating that "its basically like getting a free phone because there is a 25.00 monthly charge but ATT credits 25.00 monthly to allow customers to upgrade".  I asked MULTIPLE times so that I heard them correctly that "upgrading will not raise my bill at all".  Three other people who were with me heard them say this several times because I kept asking them... so there was no misunderstanding.  So I upgraded all 3 phones (I called my stepdaughter and told her she could upgrade as well because the only cost is 38.00) and I paid 38.00 each.  I got my next bill and it was 219.00!!!!  from 134.00 before!!  I called them immediately and they basically told me Im stuck with this new amount monthly for 26 months!  I told them what I was told when I upgraded... that it would not raise my bill, blah blah blah.  They explained that I had obviously misunderstood and there is nothing they can do for me, that my bill will remain 219.00 until the phones are paid for.  I offered to take the phones back, they said I cant because Im past the 14 day return period.  Everyone is telling me I have 30 days, but I am unsure what the return policy is.  I didnt even know this had happened until I received my bill so I had no reason to return until I knew what had happened, which was around 3 weeks after the upgrade.  The only thing they have done to "help" me is to give me a 40.00 credit on the first increased bill.  Ive paid this for a few months, called them several times.  I called them again the other day, they were rude and absolutely did not care that I was lied to.  I told them to shut it off, I am not paying this any longer.  So Im waiting for it to be shut off and my credit ruined.  When I did this upgrade, I didnt even recieve any paperwork regarding this payment plan so I truly feel they did this on purpose.  A LOT of people have told me this exact same thing happened to them too.  Ive been with ATT for MANY years and I hate this.  I even have a microcell tower in my home that I purchased for service because I have none where I live.