I had opened my PPF account in 1996 in a branch of SBI, Mumbai and got it shifted to SBI, Pune in 2006 . In March 2011, I have completed 15 years and requested the bank for extension of another 5 years. But to my surprise, SBI officials have no idea about this, they say it is automatic or these is no need for a written request or form to be filled. I am very confused with this!
1- What should I do now?

2- I am continuously depositing my contribution, whether this amount is earning normal interest.