Is it safe to buy it?

I noticed alot of people saying they got false banned recently, most of them blaming it on a credit card transaction they made not to much earlier.. now in preperation for Big Bang I wanted to buy NX and since i'm cheap the 20% extra NX looks awesome.. I mean this is the only real time i'll buy NX. Anyways I wanted to know if it is actually safe using this method to buy nx (is there a risk I will get banned?), are the people saying they got banned by it just confused or is the false bans over with now?

Thanks.