I think I'm being sent the wrong SIM card HELP

Greetings!

I recently moved from the St. Louis area to northern Arkansas where my normal carrier (Verizon) has NO towers so therefore, my Samsung Galaxy S6 is basically a brick.  I am supposing that because I will be using my phone as a "go phone" I am considered by AT&T to be a second-class citizen that does not deserve email or chat support.  If I had a phone that worked, I would GLADLY call, however that is NOT an option for me at this point in time.  I paid over $600 to buy out my contract with Verizon, knowing in advance that it would not work down here (due to major health problems I have been forced to live with my parents to be taken care of).  Unfortunately, due to some pretty severe fraud against my credit (I'm a newly retired FBI agent and my work email was hacked) AT&T believes that I have in the past (like 7 years ago) had an account with them, leaving a balance of over $400 which being on disability I cannot pay so I was forced to go with the "go phone" option, and even THAT was very very hard to accomplish.  Thank you Virgil!!  Anyway, when I spoke with Virgil, I gave him my IMEI number from my Samsung S6 so that a SIM card could be sent to me.  However, when I received the confirmation email, it says "vaious SIM for LG G2, G3, G4..".   I know that my phone takes a nano SIM card.  Will this new SIM card work for my phone?  If not, what do I do?  I am almost 1.5 hours away from the nearest authorized AT&T agent so if I have to return it, this is going to cost me more than the SIM card itself!  Does anyone know?  I would LOVE to have a "normal" account with AT&T and they even admit that this is most likely a fraudulent case since the addresss nor name doesn't even match up, however they still want their $400+.  Any ideas there?  The other issue is that I would like to go back to my Note 5 because I DO NOT like this S6 but don't have the $800 or so to pay for one.  Any ideas there?

I will say that I DO NOT like being treated like a second-class citizen just because I am being FORCED to go with this go phone account.  I cannot even create a log-in through AT&T because of it.  This is WRONG on more levels than I can count!

If anyone can answer any of my questions, please feel free to contact me at: [edited for privacy – please do not post personal information]

Thank you in advance,

Kelly H