UbuySA

I was considering buying from Ubuy SA but I'm having serious doubts, about 15 minutes ago I added a couple of sneakers to my cart without any problem but during my checkout I realised I had messed up one size, upon deleting the wrong size and selecting the correct one the price went from 776.00ZAR to 1450.00ZAR now I am a pretty sure the currency did not drop that much in such a short period. I've been calling them for the past 6 or so minutes safe for the time of review but to no avail. Are this guys legit?