United Bank Of India [UBI] — Non-credit of ppf deposit

Address:

Kolkata, West Bengal, 700037

Deposited an amount of rs.3400/- on 23/04/2014 iny my daughter, samreen akhtar ppf a/c. No.31443 with united bank of india, calcutta branch, kolkata - 70001. There is an error in mentioning the ppf a/c. No. As 31448 instead of 31443.
In spite of several letter and visit the bank has yet credit the amount in the aforesaid ppf a/c. They said the amount goes to their head office and take time to credit. But inspite of 2 years elapsed no result come.
Should i get the amount back or bank will take the amount in their pocket.