General :: Controlling Receive Call Notifications

My Android cell phone overrides my selection of vibrate mode and notification ringing volume (becomes the permanent settings) when pressing the side volume button. I was told by customer service ALL Android phones do this due to the Android operating system. First of all it true? Is there a way to force an Android smart phone to keep the receiving call volume at its intended volume setting and keep the "NEVER" vibrate selection from switching even when pressing the volume button (just want the volume button to control the audio level during a call)? In order to use cell phones for receiving emergency calls one should be able to force a phone to keep its intended receive call notification settings and not allow them to be accidently be changed by pressing an external button.