Hi
1) Hopefully your partnership firm is a registered partnership firm.
2) It appears that your other partners have cheated you and at the same time have also put the partnership firm at risk by doing hawala transactions based on false bills and thereby inviting the tax liability from sales tax and income tax.
3) The only options available to you are file legal notice to other partners asking for rendering of accounts( stocks, assets, liabilities, bank balances) and appoint an external independent auditor to undertake forensic audit so as to estimate the share of liabilities of each of the partner.
4) You should file a criminal complaint against the other partners under cheating (sec 420 of IPC), Criminal breach of trust (Sec 405 of IPC) and falsifying accounts ( Sec 477A of IPC) immediately so that you are not held responsible for the fraud committed by your other partners.
5) You should also file a civil suit to recover your hard earned money due from the firm and also make the other two partners responsible for the losses and tax liabilities( both sales tax and income tax liabilities) .
6) You should also request the court to appoint an advocate commissioner/ receiver to manage the day to day affairs of the firm till such time the assets and liabilities are distributed, disputes with tax authorities are resolved and partnership firm is dissolved or transferred to you (you + another new partner.)
Hope this helps