I haven't used the calling card yet, but here is what happened. When I placed the order, I was notified that I would be contacted by a representative. I received the call to confirm the security code on my card, then I received my calling card number via email, etc.
The next day, I start getting alerts from my credit card company about large purchases. So far, in two days, there are 5 suspicious pending charges on my account, totaling more than $3,000.
I used one of my business credit cards that is used infrequently. I'm not concerned, as my credit card company is good at resolving these issue. Still, it is no coincidence as the card is in my possession always and only used for some recurring payments and a very occasional purchase. This is too much of a coincidence. Avoid at all costs.