Well hope you have the copy of the original agreed contract signed by the employer/sponsor...

Hope that you did not signed the new one which you are not comfortable with...

You can persue your case with the Higher management/HR of the company and even to labor ministry and also can take help of your Embassy....IF you want to continue with the same employer.

By the way if your RP is not stamped you can leave and re join any other good employer without the concent of the previous sponsor.

For the matter if you already have the RP stamped and and perhaps if you find better alternate within these days, you can change to better sponsor/work with the help of the ministry if and only if you have registered the dis agreement with the Ministry and yet the original sponsor still dont follow the agreed upon commitments..

All this can help if you did not sign any other contract or document which suggests a agreement of the newer position...and registered your plea to who so ever concerned in TIME...

Rights are always there in any society...unfortunately one has to struggle to get it in most of the societies...

TC & All the best...