How about firing you from the client and then rehire you after 2 weeks?

OR

There is no agreement that is valid, as far as desi consultancy is concerned. They have mentioned so many things in the offer letter. Do they obey that?

Safe approach: Call your main person from the dhoti consultancy and politely request him to join the client. Make him believe that you will bring some more people like you in the consultancy and help him to repaid the void. Its all about exploiting the emotions....

Good luck
-Biratnagar