India Post Office — SSA account transfer problem

Address:

Tonk, Rajasthan, 304804

I want to transfer my SSA account to State bank of india but my post office here where I have SSA account now denied to transfer the account. And they say that it is not possible to transfer the account. The service here is very bad. Post master is very bad in service. He does not have basic knowledge of his work. Always delays work. During opening account also I had to suffer a lot. But that time no other bank was opening the SSA account. Now I want to transfer since SBI is opening SSA accounts. PLease help me . Also please advise what are the documents to be collected from post office in order to transfer my account.
My post office is in deoli - 304804, rajasthan, india.