ZVRS app on iPhone problem

Does anyone have volume problem with ZVRS app on iPhone? My iPhone is always on mute or set volume to zero. This app seems to override my sound settings, even I disabled the ZVRS audio in the setting.

I'll explain what happened:

• Launched ZVRS app, entered the # to call
• ZVRS advertising appeared, is loud and had to set volume to zero.
• Interpreter appeared, calling other person, can hear both of them. Had to tell interpreter to kill the audio. (I have no control over there)
• Called ZVRS customer service, informed them what happened. All they told me was that it on Apple's side, not them.

I am not sure if they are being honest or not. Most of the apps I have on iPhone is set to mute or no sounds which worked really well. I think it must be ZVRS who didn't want to spend more time investigating the issues, let alone blaming Apple for this. It's been like this for a while.

I love this app but it need to be improved, not left alone.

What about you all? Did you experienced the same issues?

I'm not aware of volume. Thank for let me know.

zvrs is still around? omg!