I PHONE 7 HAPTIC TOUCH NOT WORKING PROPERLY

I'M USING I PHONE 7 TODAY I USE MY PHONE WHILE IM SWIMMING IN THE POOL COZ I THOUGHT MY PHONE IS WATER PROOF BUT NOW MY HOME BUTTON IS NOT BEHAVING PROPERLY THE HAPTIC TOUCH IS NOT UP TO THE MARK SOMETIME ITS TOUCHED 3-4 TIMES AND SOME TIME STOP RESPONDING .? WHAT I HAVE TO DO ? OR DO I HAVE TO GO TO NEAREST APPLE STORE SO THAT I CAN SHOW TO APPLE STORE .. WILL THEY ENTERTAIN ME FOR THIS ISSUE . PLEASE HELP ?