Well, now that we are on the same page!

Yes, you need to ring both bells at the same time to crack the face of Lahkesis. Then, use the battering ram to smash a hole in her face!

While you are there, there are two secret areas that can only be accessed by the battering ram. They are off to the rear of either side. You must run along the battering ram as it circles around the back and jump/glide to reach these areas!