IPhone is damaging my sim card?

When i took my sim card out of my iphone, it was dented and scratches, so i put a new sim card in and took it out and there's a dent and a scratch again, what is causing this?

iPhone 4S

Have you ever dropped your phone? Has it ever been subject to a hard impact? Is there anything you could have done to damage the SIM TRAY?

Lmfao!