Burkhas/Niqabs

The best way to deal with Burkha/Niqab wearing people is to ignore them.
If they choose to hide their identity then they are (de-facto) invisible and should be treated so.

Refusing to speak, listen or acknowledge them within banks businesses etc will encourage employers implement and enforce a 'Face-to Face' section in the Company Policy document.

I believe the wearing of religious apparel is inappropriate in almost all work related and educational circumstances.

Religios opinions, if you have any, belong inside your head and are strictly between you and your chosen imaginary friend.........