I bought a calling card from STSprepaid.com an internet company. The card was advertised on their website to give me 33 minutes of of talk time in a one single call. I actually used the card in one single call without interruption as the advertisement said. The card only allowed me to talk for one third of that time (10 minutes only). I called the customer service three times. The first time they only allowed me to leave a voice message. I left a voice message, explained the problem and asked them to call me back. They never did. I called them the second day again. Finally some one answered. I explained the problem again to them. They said they can do nothing about the problem and hung up on me.

I called for the third time, they did the same thing and hung up on me. I never seen such a bad service.
My advice to any one: Do not use them.