I would suggest you to do the following:

1. Make complaint to the High Court based on evidences you have on hand making these ground for not going ahead with the deal;

2. Making similar complaint to the ROC and SEBI;

3. You would also have to refer to the stock purchase agreement including the MOU and hunt for clauses which prohibits causing losses to either party; provided, in the first place, you have taken care to include such clauses protecting your interest;

4. The deal period within which the legal formalities would be completed and the riders, in case if it's not completed;

5. Provision specifically giving you an exit option in case of not adhering to the deal documents.

These are the general procedure to be followed as I do not have the underlying contracts to verify the provisions that can empower you to terminate the deal; albeit it might be time consuming as it is court driven.

thanks,