some rules that i would do before purchasing on lazada (in fact, on many other sites too) :
1. check the seller if they are reputable or not. the rating isn't always reliable because if only one person rate 5 star, then that seller will be a 5 star seller, even if he has bad reputation
2. only buy items with immediate stock and not with "shipped from other country" tags
3. always, always do COD
4. if it's the price is too good to be true, it probably is. best to check on other sites to see if anyone else is selling at the same price. if not, then it could be fake or scam and not worth risking

I have a feeling that rm799 is the imported version? Which has its own separate reason to not order

Anyway, I won't order. Even lyn seller is more trustable (if you know where to find a good seller)