Cricket Cellular/AT&T Sold me a phone, that they knew would not work on their system within a matter of months. Colorado Springs Colorado

I went into the local Cricket Cell Phone store in December of 2013 to buy a new "smart phone" of some type and upgrade my service to include internet for use with that phone.  I told the sales rep. that I was wanting a new 4G phone to work with the 4G they were about to get.  I had heard about them getting new 4G technology on local TV ads.  She pointed out all the new phones they had gotten, for this new service they were about to start offering.  I ended up purchasing a ZTE Source 4G phone.  I also got a number of accessories for it, including an armored cover and a screen cover/protector.  This totalled right at about $300.00 with tax.  I also upgraded my service from a plan that was $30.00 a month to one that was $70.00 a month.
  I was told that the new 4G service would start when the merger with AT&T was signed, sealed, and delivered. and that it could be a few days, or a few months.  After waiting a few months, and had no 4G service yet, I went into the store and asked about it.  I was told that it was still up in the air, and would start as soon as the merger was complete, but it could still be a few more months.

I waited a few more months, and went back in again.  This time, I was told that the 4G system was up and running.  She asked to see my phone, and when I showed it to her, she told me that it was one of the older phones, and I would have to buy a new phone to work with their system.  I explained to her, that I had just bought the phone from them a few months prior, and it was supposed to work with this new system after the merger.  She said that when they had sold the phone, that was what they were told, but it was incorrect, and I would just have to buy a new phone again.  I asked if they were planning on making this right, and she responded no!  They were told that these phones would work, and they don't, so the customers would just have to buy a new phone.  I pointed out to her that they, Cricket, were the ones that told me this phone would work with the new system, and that they, Cricket, were the ones that sold it to me.  And it was they, Cricket, that needed to make it right.  It was their mistake, not mine, and they needed to replace the phone with one that would work on their new system.  She said they would not be doing that.

I asked her if she cared that I would be trying to get the state attorney general involved, possibly look into a class action lawsuit, not to mention they would be losing me as a customer for life.  She responded with the same "canned response" that she had already given me 3 times during our conversation.  "This is what we were told"!  Like the fact that they were told by their supervisors in error, somehow made it OK to ripoff your customers.  They just do not care at all that they ripped off thousands of customers.  Needless to say, if they do not fix this, I will do everything I can to see that they pay for this scam.  Karl P. Mxxx.