u bought that acc or? cuz in some country's u cannot use some payment methods
my friend also had that prob, creat a new acc in sro, email veri. it and buy the silks on this acc and after that u trade the silks to your main char :P
my friend hadnt be an error he just couldnt use walli-card, he also wrote an email to joymax but useless answer.... the only solution is to buy silk on an other account and trade them on the char you want