I don’t think there is any kind of such charges applied. LIC premium payment is nothing but any kind of utility bill payment only and I never find any kind of charges online. Did you you contact your credit card department about the charges or asked your LIC agent or officials about the same?
While shopping offline I found many vendors are charging sometimes 2% extra for credit card payment. But not sure about the same in case lic policy premium payment. may be some reader may answer your query better.