Where does matter disappear in a black Hole

We know very well mass can be converted into energy.But other things in this universe like space time matter are they inter convertible they should if not there could not be any big bang, because all came from singularity

Well from general relativity, it is well understood gravitational force is state of acceleration. Then to produce acceleration we need force which is derived from energy, so matter has one more face ie is gravitational energy interchange between gravitational energy and matter occur function of density of matter

Disappearance of matter in black is appears like a puzzle . From above discussion it appears that all matter is converted to gravitational energy in black hole