no receipt return

For the last several months all items have been returning full price even if in that week we are running a sale on them, has anyone else had this? We've told our AP and they said they were working on it months ago but then nothing ever changed.

guest comes in with a pre paid phone. no box, no reciept. his dad's with him dad: we've spent hours on the phone with the company, and they can't activate the phone. you didn't do what was needed. me: finds out he has nothing, just the phone. is there any proof you bought it from us? dad...