You are right. THIS IS A SCAM.
I had the same experience.
We purchased Samsung TV last year from El Corte Ingles and we were told about the promotion and we will get a refund of €200 if we purchased the TV.
We participated in Samsung promotion and the information which was required it was sent to Samsung.
We got a confirmation from Samsung that we have been registered in their system.
We telephoned several times and it was confirmed that we have been registered and the money will be sent.
Few days ago we telephoned to find out the status of our refunds and we were told that we are not entitled as the information we sent was not accurate.