If the current job at E & Y Global Shared Services is of a BPO or KPO role, then it can stifle the application of the knowledge you possess and leave you with an insipid sustenance to continue in the end. If on the other hand, it is an India Finance or taxation profile, you can hook on to it for some more time and hope for challenging assignments that may stare at you.
On the contrary, if you are fervent to deal with Mortgage related work as a Manager in one of India's premier bank, then you can opt for the new assignment. However, the critical question to ponder is whether working on a Mortgage related profile could bring you value addition and weightage on your curriculum vitae.
Hence, determine the relevance of your growth in the organization in an astute manner, to see whether you are developing personal and professional traits to survive in the organization. It is easy, to be carried away by tall promises made by your present and prospective employers, but the truth lies somewhere between the two.
Before, you decide to move on, kindly be more circumspect and pragmatic, as they say a known devil is far better than an unknown angel is.
Best of luck
Sathish