AT&T lied about the Next plan

Back in May my Motorola Atrix was pretty much unusable. It had a cracked screen and I was no longer able to use the touch screen. My upgrade wasn't until October but on several occasions a representative from AT&T has allowed me to upgrade a little early. I usually upgrade and get a $50-$100 device. I went into an AT&T store in my neighborhood to see what they could do. The representative told me that he could definitely give me an early upgrade. He also told me he could make my plan much better for cheaper! He told me to pick out any phone I wanted and that I would only have to pay $50. I thought this was amazing that I could pick any phone and kept asking "Is there some kind of fine print I am missing?" or something along those lines. He said nope and that I only had to pay $50. Sweet! So I went ahead and got the device and a case and was on my way after paying. Three weeks later I get my bill and it's $352!!! My bill is normally around $130 for two lines with 4 gigs of data and 450 anytime minutes plus unlimited texting. I called AT&T to find out what the problem is and was told I was placed on the Next plan. I asked why my plan was changed and they said that I changed it when I got a new phone and explained the charges. I was put on a 10 gig plan plus unlimited talk/text and I was paying $25 for my device for 18 months. I explained that I had no idea I was having to pay in full for the device and that I was never told about the $25 monthly installment for 18 months for the phone. They said they were sorry and lowered my plan to 6 gigs and told me my bill would go back down to around $130. Well, the next bill comes around and it's $170... $40 more than I am used to paying. I called again and explained that I was put on this Next plan due to negligance of the worker at the AT&T store and asked if there was anyway I could get out of this plan and not have to pay for the device. They explained that two weeks had passed and there was no way I could get out of paying for the device. I told them that if I would have known I would be paying $25 a month for 18 months for a new device that I would have just gotten a crappy go phone and waited until October. I escalated this case to management and filed a case. The rep told me that management would be in contact with me the next day. Well, the next day comes and goes and four to five days later I finally call back for probably the 4th time. The person I spoke with this time told me that the case was closed because the 14 days had passed. I was infuriated! I was told to go into the AT&T store and speak with a manager about what had happened. I went to the store and the manager pretty much talked to me like I was stupid, explaining that I had the newest phone and that it was actually a great deal. I told him I didn't care if it was the newest phone and that if I would have known I would be paying $25 for 18 months for a new phone that I would have just gotten a go phone until October. He did absolutely nothing for me. I am so beyond frustrated with this whole situation. AT&T Next is a huge scam and now I am stuck with a ridiculously expensive phone plan for the next year and a half. I cannot wait until my contract is up so I can finally switch carriers after ten years of lies from AT&T!