Will Vodafone replace my faulty iPhone 5s?

So on march 7th 2014 i signed a contract with vodafone for an iPhone 5s. About 7 days later i returned the iphone because it was faulty. The vodafone shop then replaced it with a brand new one. Today 12/05/2014 my phone home button was fine until suddenly it felt like something was stuck in it. I asked a friend to have a look to see what he thinks and he believed that the button is pressed in. At some point the phone sometimes won't wake up until i press it twice. I was wondering if vodafone would replace it again because the phone is faulty. One thing i'm not happy with is if vodafone replaces it with a refurbished one. I have seriously bad history with refurbished iphones and am very unhappy if vodafone does that because the phone only just went into its 3rd month. Can someone please help me i'm not sure what to do anymore i'm getting really sick of this. This is my second phone replacement and it is now faulty again.

I had the same problem with Optus but I had the sony Xperia Z. I had that replaced twice until they finally saw things my way and gave me a samsung and i have not had any issues. If its still under warranty you should be able to get a new phone for free. I didn't have to break my contract or anything when I was given the samsung either because of all the inconvenience they had caused me

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