please explain what you mean by "***charging port is gone***".
There are 2 vol buttons (+ & -) and a mute button, what is not working?
Do you get any sound? Is your charger working? Do you get any charging indicator when you plug it in?
The vol buttons are on the main board. Power comes from the opposite side where the battery and charging board is.
There are a couple version of this headset and there are tear down instructions, one being on [guide|75217|iFixit].
And a couple on YouTube.