TMobile scam to give free device

Just started 3 days ago was told will receive company discount before we started I said are you sure they said yes we signed up now they are denying my 15 percent discount already what's next are they going to tell me they are not going to pay off our Verizon phones we just switched from Verizon to this company I hope it was not a bad move how long do I have to cancel ? Was on phone for over 2 hours just for them to tell me nope you don't qualify that's not what I was told in store John told me he couldn't find my company and when I tried to sign up on email sent to me automatically denied do they do this to everyone and will they really pay off our Verizon phones I am very upset about this kind of situation all ready!