Builder is refusing to give NOC for loan transfer

I have a home loan from SBI ,Tilak road , Pune branch for my flat in Pune. I wish to transfer it to HDFC Bank to get benefit in inerest rate. HDFC has asked for NOC from my builder , for processing my loan. The builder is first asking for a NOC from SBI stating that SBI doesnt have any objection to the loan being transferred. Please help me to resolve this deadlock.My loan is already sanctioned and i have paid processing fee