You will want to contact Apple corporate from the links provided by @___Bubba___.
Have you tried getting Unicorn Info Systems to fix the Mac again or if they made mistakes with the repair to have them correct those mistakes? Speak politely to a manager if necessary (at both AASPs) to explain the situation since many times the public facing techs may not have any authority to make repair exceptions. Plus if mistakes were made with a repair, the manager may not be aware of any problems with their employees.
Unfortunately I have seen a few other posts on these forums about very poor service from AASPs in India including posts about being unable to receive service for various reasons. If you cannot get Apple corporate to help you, then you should contact a lawyer or local government representative to see what options you have available.
If you do succeed in getting service, then please update this thread so it may help others in a similar position.
Good luck.