My Iphone has a problem with the microphone it doesn't seem to work! so there for i can't use Siri anymore..:-( this has been playing up for some time now.

My Iphone has a problem with the microphone it doesn't seem to work! so there for i can't use Siri anymore..😟 this has been playing up for some time now. But as my wife & I had a baby 7 Months ago🙂 I have not found the time to pop in to the apple store until today (8/12/13) and they told me that they couldn't help as it's out of it's warranty by 57 days 😟

Can antone help me? is there something i can do, apart from buying a new iphone!