directv + Amazon promotion is a scam ,Directv called with a promotion they have in connection with Amazon - must pay 5mos service with Amazon gift card to activate Nationwide

I rec'd a call from Directv today- it looked legit from the caller id. They had a promotional offer. There's nothing  out of the ordinary in that.  They offered $59.99/ mo for 24 mos (69.99with 2tv's)  if I prepaid the first 5 mos with an Amazon gift card.   What I needed to do was get the Amazon card to prepay 5 mos and then I would get $100 back for doing it on the same day.  Fortunately, i applied the card to my Amazon acct, so I had to call to try and reverse that.  It was then that Amazon let me know it's a scam.   I called directv and confirmed this was a scam.   It was a good scam.  They fooled me.  Nothing seemed that unusual, and the caller ID looked like directv.  The number i was to call to activate the offer is: 88-770-6370.