FYI. I available of a similar offer a couple of years ago, it may not still be the case, but at the time they imposed a strict "window" for claiming cashback, also the online experience of claiming was tedious to say the least, in the end I had to resort to tweeting at Samsung to get my money...
Yeah, you claim between 30 days and 60 days after purchase.
Completely opposite to your experience, I did a cashback with Samsung before Christmas on a flip phone. From claim to money back to me was less than 10 days.
Just on this, as I may be getting one of these next week, is that 30-60 days think literal as in you have to wait 30 days after you purchase before claiming?