Buy and Get - Worst service ever

Bought one of the qualifying products during December 2015. Followed all the steps for registration. I was informed that my serial number does not display correctly (although it did). I resent it. Not a peep from them after that.I have made calls to the helpline on three occasions (20+minutes waiting) as well as an email. Was informed that there is a problem with my serial number at Samsung, and that someone would contact me the same day. No response as yet. I have to book my flight tickets, and no one is able to assist me. By the looks of things here, Samsung has lost a lot of loyal customers. Personally I will never purchase a Samsung product again.