I'm guessing its a standard serpentine belt....release the tensioner....install new belt. Readjust tensioner. Not a lot to it....if you were still running the original belt after 11 years.....then its kinda obvious why it failed. Hopefully you aren't maintaining the whole vehicle that way! 
Also, pretty much nobody here owns an A-class.....they are not sold in the USA....I personally have only seen a few in my life when visiting Germany.....and one in Canada once....
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