IMEI No altered ???

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Aug 22, 2013, 6:33:05 PM via Website

Just now I upgraded my Galaxy S3 to a latest version(Official). Following this the phone refuses to either receive calls or make any call. On examination by the service man, it is revealed that the IMEI No of the phone is altered ????. The phone is still in the wrrantee period. Purchased from a store in the middle east, but being used in India. The phone can be used for all other purposes, but for telephony. Plkease advise