State Bank Of India — house building loan switch over

Address:

Birbhum, West Bengal

I have house building loan having account number [protected] in Santiniketan branch, west bengal( branch code is 2121 and IFSC code is SBIN0002121) since June-2009 with 9.25% rate of interest. But from 01/06/2014 SBI increased rate of interest to 12.50%. The branch manger tried to switch over the rate of interest from 12.50% to 10.15%(present rate) w.e.f from 01/06/2014 but Mumbai office is not allowing it. I am paying too much interest in every month. I need switch over as early as possible. pl do needful. I am ready to pay the required money for this switch over purpose. Thanking you.