That's a load of crock! I'm sure you have pointed out to him that he has incorrect info in his listing and 1) he should correct his current/future listings imediately and 2) should pay for the shipping himself.
Then again, he may be stubborn and stick to his guns (likely scenario) so it may not be worth your time to keep arguing back and forth and either pay him the 30 bucks or sell the wrong ones somewhere else and buy the correct ones (preferably from another seller).
Good luck! :thumbsup: