wantickets.com é seguro?

I tried to purchase a ticket on their site and I had a promo code for 50% off the price. I tried several times to enter the code and the site was not taking. Besides that, it was showing that the tickets were getting sold out soon. So in order for me not to loose the tickets, I purchased without the promo code and then try to contact them for the refund of the 50% and they do not have customer service, only true the web, and the only thing that they could say, was that I had already purchased the ticket without the promo code and they could not do anything. It is not my fault that their site did not take the promo code. I confirm with the promoter and he said the promo code were valid. Scam people. Stay away from them.