Gmail — my gmail account hacked & name, photo changed

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Gmail

My gmail account hacked on 27.07.2017 @ 22.30 hours & name has been changed from prashanth shetty to asma mohammed, also photo changed to arabic letter image. Yesterday i have changed the password & somehow i have changed the name as prashanth shetty (Original). Whenever i am trying to change that image, it will change but once i logout it will remain the same hacked image. Hence i couldn't able to change the image permanently. Kindly help me to solve this problem at the earliest. My gmail id is [protected]@gmail.com.