damaged DRONE Poor customer service what is the repairs dpt for?

Monday 24th December 2018 I had purchased an FPV Race Drone for my daughter who is 10yrs old. As a xmas present. Only to find that the race car doesnt have an on button. So on the 26th as my daughter started playing with it it didnt do what it was suppose to do. Monday the 31st of December 2018 I returned it back to toys r us and that was the only day I was available. Guess what ? I WAS TOLD IT WILL NOT BE TAKEN BACK NOR EXCHANGED AS IT WAS ALREADY PLAYED WITH AND HAD NO ON BUTTON...DRONE IS ALMOST R700 what my child suppose to fo receive a gift and not play with it? How were was suppose to know what on button looks like....and I returned it within 7days. It is not fair that I am losing R700 for information which I was not given prepurchasing. What about the KYC, Act and treating customers fairly? Why will it not be repaired nor exchanged? Is it fair for me to lose my money?