Allahabad Bank — education loan issue

Address: Kolkata, West Bengal, 700084

I have taken an education loan in 2010 from your bank, currently which is successfully repaid by me.
In the loan terms and conditions, it is mentioned that - if i repay the loan within the time then i would be eligible for 1% rebate but after successfully repaid the loan amount within the time i till now i don't receive the rebate as you're assured.
I have also submitted a complaint in your tollygunge branch mentioning that same but till now there is no action taken against this please let me know to whom i need to contact and how much time it will take to resolve.
Thank you

Regards,
Rajat chakraborty
[protected]@gmail.com