ME301T tablet does not connect to Internet

My ME301 T tablet ( Android 4.1.1) purchased Late March 2013 , lost internet connection on Dec 24 /13. WiFi is showing as being connected but screen states ther is no internet connection, I have unplugged router and reconnected it . I have rebooted tablet - both of these things I have done multiple times . No success. I have been informed that it is a "radio problem(?)" and will have to be replaced by Asus . How do I return it ?

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