HDFC Bank — Minimum Balance Charges imposed despite maintaining enough balance in my customer ID

Address: The Mall Shimla - Himachal Pradesh

I am holding a saving account and fixed deposits with Shimla Branch and maintaining sufficient balance in my customer ID. Last year I was charged on different occasions Minimum Balance charges totaling upto almost Rs 5, 500/- on the pretext of not maintaining sufficient balance.
On approaching the bank personally the person insured assured that the charged will be reversed however it will take some time . Despite this assurance I was again charged on two more occasions.
I again approached the bank and some amount was partially reversed and credited to my account and I was informed that the balance will be reversed subsequently. I was told that since the branch manager has a limited authority per month it will be done in the subsequent months. This never happened despite my repeated followups. After few months the person incharge dealing with my complaint was transferred to another branch and my case was pushed under the carpet. As I am staying out of Shimla I cannot visit the branch every now and then. Kept following up on emails and WhatsApp but without success or response. Finally I got ho;d of the new relationship Manager and passed on the details to him earlier during the current year. I was again assured that the charged will be reversed but no action was taken except verbal assurances . Even my emails are not being responded to . After 6 months I again reminded to follwup and threatened to escalate the matther to the next level so another small token amount was reversed . Half of the amount wrongly charged to my account still stands recoverable ( Approx Rs. 3000) After this I approached / called the branch Manager and appraised him of the entire situation though he was copied on all my email communication in this matter. I was again assured that the matter would be resolved within one week. I again topped up my email communication to this effect. Unfortunately nothing moved further even after approaching the Branch Manager as well. I am trying to lodge an online complaint
https://leads.hdfcbank.com/applications/webforms/apply/HDFC_CustomerCenter/Custo...⇄
This link takes you to a certain page after that does not allow you to update anything further so cannot even file an online complaint. Without reaching the next level even the banking ombudsman is not accepting the complaint. I am seeking assistance how to recover my hard earned money siphoned off from my account.