Flippy good suggestion!
I once had a hello mobile sim card that came damaged and stopped working the first day. I called the company asking them to send me a new sim, as this one seemed to be damaged. They wouldn't agree. They told me I need to clean it, try in other phones, etc, and that they are "unable to send me a new one". Finally I said, "Okay, whatever, I'll pay for it. Whats the price?"
They said "Okay, we are sending a new one free of charge."