What do I do when my volume button on my headphones stop working and my right ear is out too??

I tried to use my headphones on YouTube and all of a sudden my right ear goes out then when I tried a different video my volume up button becomes the

I tried to use my headphones on YouTube and all of a sudden my right ear goes out then when I tried a different video my volume up button becomes the volume down I don't know what to do!!

or:I tried to use my headphones on YouTube and all of a sudden my right ear goes out then when I tried a different video my volume up button becomes the volume down I don't know what to do!!

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