Missed the point on communicating with the Tax Govt people by snail mail - you want it that way. Working with them over phone or email will inevitably lead to you being hit with fines and other nasty scenarios.

Always get a lawyer to represent you when the Tax folks start an audit. Never tell them anything over the phone or email. Always ask for a letter and provide explanations via letter. Do record all communications with them. Never say anything they did not ask for.