I was online and seen COD was on sale without looking at which platform it was for and purchased the digital copy for the PS3 can I use the digital upgrade to PS4 even though I never downloaded the PS3 version?
Welcome to the Playstation Forums.
You should give Sony a call and tell them what happened, they may reverse the purchase so you can get what you wanted.
The truth will set you free... But it may sting a bit...