Target Mobile

I went into my local Target to pick up a smart phone. When I got there I was convinced to buy a table and sign up for Verizon. I was told that if I returned it within two weeks, I would not be charged for service. I took it home and looked online and saw the device had poor reviews and decided to return it. I had the phone less than 24 hours. When I went back the person who sold me the phone tried to convince me to keep the tablet and try it out for "just a few more days".
I said no, the paperwork said if you don't return it within 3 days, you loose your $40 activation fee. She told me that she had never seen that happen as assured me that I would be under no obligation if I wanted to try the phone a few more days. I said no and returned it.
Now I have a bill from Verizon. Fortunately I didn't keep the phone but got charged $2.13 for less than 24 hours for a plan that was supposed to cost $40 a month. Actually I got a bill for $71, but since I returned it I only owe for one day, which I was told at Target mobile would not happen.
Verizon told me that if I had kept the phone beyond three days that I would be stuck with the activation fee. They also told me that that is the commission the sales person receives. So it looks like the sales person was not being truthful in order to get their commission.
When I called the store about this, I was told I was not the first person to bring this to their attention. So my question is why does Target allow this to happen. Yes, I know the mobile department is contracted out, but it is in a Target store and they wear badges with Target's name and logo.