car cassette jammed?

i have a cassette stuck in the player. this is causing it to affect my battery. need it out. dealership wants to send me to best buy who wants to send me to the internet.. so, here i am. the car is a 2003 hyundai sonata. best buy claims that they will surely trash the system. i don't need the cassette to work anymore, but hope to keep radio and cd player from harm. not to mention that remote access and clock are involved.