A few questions before I give you some advice 
What model of headset do you have? Where and when did you get it? How long have you owned it?
What happened to the ear hook exactly?
Regardless, I'd recommend you call us directly for advice, since the process can vary by country: http://www.sonyericsson.com/cws/corporate/common/contact/phonelist They should be able to point you in the right direction!
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