I think my SD slot reader is broken.

I once had a smaller card that didn't fit the slot reader jammed into the camera I didn't realize it but when I took a knife and jammed it in there and got the card unstuck I think I may have broken one of the pins in the card reader because now my camera will not read any card I can't even format the card when I put into the camera it just says the memory card cannot be used and I've tried formatting the cards in different ways and I even formatted it to one gigabyte which is supposedly the maximum size cards that the camera reads and I changed the formatting settings on the card put it into the camera and it still doesn't work what do I do