Employee provident fund applicability

Hi

Currently I am working in an organization where my employer is deducting EPF for last one year and now looking for the change. Got an offer from another organization which is PVT LTD but they are saying that they do not have EPF account policy for their employees (Total employees are more than 20 & salary offered is more than Rs. 15,000/-). I want to know:

1. If an organization can skip EPF contriution scheme voluntarily.

2. What will happen to the contributions I have made yet, if I will join that organization and will no more contribute to EPF scheme.

Thanks