1- Why not ask the DO for full explaination (in written)?
2- Check under what terms and conditions they have cancelled your agency. Then only I can comment.
3- What do you mean by Visitor Agent?

Minimum Amount of Business to be secured by the LIC agents
An agent shall bring in the following business in each of his First, Second and Third agency year-
“Proposals resulting in policies on at least Twelve different lives for not less than First Year Premium Income (FYPI) of Rs. One Lac;
Provided that a shortfall in fulfillment on one count namely lives or First Year Premium Income shall be condoned up to a maximum of 50% at the end of 3rd Agency year:

Provided further that it is compensated with same or higher percentage increase on the other count and further subject to the condition that the agent brings in not less than six proposals resulting in policies on at least six different lives and at least Rupees Fifty Thousand First Year Premium Income in each of the First, Second and Third years of his agency.

In Fourth Agency Year and in subsequent agency years, at least Twelve proposals resulting in policies on at least twelve different lives with First Year Premium Income of at least Rs.1 Lac. Please note that the condonation shall not be applicable from fourth agency year onwards.