Hi mister,
That’s great news … maybe they just got tired of all the questions you were asking and decided a refund was the easiest way to deal with you 
In any case … the better possibilities in the Nashville area I’m aware of are listed in post #7 here.
As with all mattress purchases … these are possibilities that may have some better quality and value but it’s always important no matter who you are dealing with to make sure you can find out the details of every layer of a mattress you are considering so you can make meaningful comparisons.
While starting over again is never the “ideal” … I think in your case its about the best outcome that could have happened!
Phoenix