Dear Venketpelluri,
Now, there are many legal books available on "How to terminate an employee," "How to initiate disciplinary actions," etc. Your case seems to be quite simple.
Once you have sent the show cause notice to the employee through a messenger and it is not accepted and acknowledged by the employee, the messenger has to return the document with his remarks "refused to accept" with the time and date written on the envelope. If possible, he may try to get the signature of a witness too. It is not always possible to get a witness to sign because they are also part of the union.
Refusal to accept any official communication is another misconduct. Towards this, you should initiate another show cause notice. Let both of these be displayed on all the notice boards. Since the employee is present during these days, it is enough to have these on the notice boards. On these memos, you must write cc: Notice board. The employee may now realize that the employer is serious and try to act accordingly.
Upon expiry of the time limit specified, frame the charge sheet and send it again to him, and of course, with a copy to all notice boards. Within the time limit for his reply against the charge sheet, if there is no response, arrange to conduct an enquiry. Give him a chance to appear for the enquiry along with a co-worker if he so desires. In case he does not care to attend the enquiry, proceed and conclude ex-parte. The enquiry just has to show whether the employee is guilty or not. Then, the punishment can be decided by you as per the rules.
During this period, if the employee is present, you can never mark him absent. Marking him absent while he is present is a punishment, and punishment without going through the proper procedure will go against the employer.
There is no rule stating that the employee has to accept and acknowledge official memos.
The attempt to communicate in all possible means is the only approach. Putting up notices on the notice board is proof enough of that.
In case the employee is absent, then only you have to send it by registered post. In this case, repeat it twice and prove that the employee is not available at the last known address. You may be lucky if the postmark "refused to accept" appears on the returned envelope.
Regards,
Kesava Pillai