Renewal of a partner's visa to avoid the loss of partnership

A company has two partners P1 & P2, and P2 partner's visa expired. In order to give the complete ownership to P1, P1 is hesitating to provide the money for the share by giving excuses of liabilities.

P1 owns 75% share and P2 owns 25% legally approved by the government, but with an understanding between the partners, they came up with another contract by P2 having only 10% with no liability.

The only issue is that this contract is not government approved, is it still valid? Now, P1 is trying to acquire the whole company by not allowing P2 to renew the visa.

What should be done? Should we file a case? If so, what would be the procedure?