escalating issue with US visa scheduling people

Stuck for weeks now . No update on the case. Calling them is waste - no one picks up and it gets disconnected. When it gets connected, they keep saying it’s going to take one or two days.

Is there a way to escalate the case ? I am really tempted to write them a furious email but holding back.

Also I just came across a telegram channel where few people are claiming to get visa slots for money(which otherwise show up as ‘no slots’). This makes me a bit suspicious .

Edit: I’m getting applicants biodata locked. No response from the call centre or for the tickets