Cricket Wireless Refuses to refund my money after I cancelled my account. Phone battery getting hot and swelling case. Nationwide

I called 7 times and visited all three stores in my area and went on their website and told them that my phone that I purchased in November 2016 was getting extreemly hot and the case was swelling up.  I told them I was calling them on that phone and they kept placing me on hold.   I finally got some women that sent me a shipping label but I expressed my concerns that  shipping this back was like shipping a bomb.  She said don't worry about it, wrap it in newspaper and place in a box and ship it.  I called and stopped my auto pay but they withdrew the money anyway.  I called and they said they will not refund my money and not having service makes no difference.  I am out a phone and my money.