No life insurance company doing business in Mississippi shall make any distinction or discrimination in favor of individuals of the same class and equal expectation of life in the amount of payments of premiums or rates charged for policies of life or endowment insurance, or in the dividends or other benefits payable thereon, or in any of the terms and conditions of the contract it makes. Nor shall any such company or any agent thereof make any contract of insurance or agreement as to such contracts other than are plainly expressed in the application and policy issued thereon; nor shall any such company or agent pay or allow as inducements to insurance any rebate of premium payable on the policy, or any special favor or advantage in the dividends or other benefits to accrue thereon, or any valuable consideration or inducement whatever not specified in the policy contract of insurance. Whenever it shall appear to the satisfaction of the commissioner, after a hearing before him upon notice, that any company, officer, agent, subagent, broker, or solicitor has violated any provision of this section, he shall revoke the license of any such company or person to transact business in this state; and no other license shall be issued to any such company or person within one (1) year after such revocation. However, nothing in this section shall prevent a company which transacts industrial life insurance on a weekly payment plan from returning to policyholders who have made a premium payment for a period of at least one (1) year the percentage of premium which the company would otherwise have paid for the weekly collection of such premium; nor shall this section be construed to prevent the taking of a bona fide obligation, with legal interest, in payment of any premium.