HDFC Bank — Not able to solve an issue regarding wrong transaction

I informed the bank regarding a wrong transaction(it was a user mistake) but for my surprise bank is just playing and buying time for resolving the issue.In terms of solution when i first visited the branch(sher-e-punjab, andheri), there relationship manager Mr. Amar Shah was totally non-supportive and just said ki "kuch nahi ho sakta".Present day status is i have a complaint id- 'HBL=[protected]' yipee. Who the hell says private banks are better? In-fact when it comes to caring for customers they are even worse.