Verizon sent me extra note 4 topic

So long story short I pre ordered a note 4. I found out I could get one sooner at the Verizon store so they canceled my pre order and I got a phone. Two weeks later my pre order showed up. Its been several months now and they haven't charged me and the IMEI is free and clear. Should I call Verizon or chalk this up as getting g a return for years of getting screwed on my bill