If you can take it to a different Apple store. Apple tried screwing me about MacBook Pros but I stood my ground and got a replacement. Bending an iPhone5 is awfully difficult and shouldn't happen even if it's in your pocket. They should also atleast run a diagnostic test while you're in store. One of the so called "Genius" (who may I add know less than anyone who's got any idea about Apple products)
Also have you tried googleing this issue?