I would like to tell you that HDFC Bank not yet issued the Application form for Deactivation/ Stop of ECS service, here I will get updates to check easily or you may contact the nearest branch.

Have a glance on this process

Go to official site of HDFC Bank
At bottom middle page
Click the option of form centre
A new page will open which looks like this
There you can get information easily

HDFC Bank, form centre



Right now I have this latest forms issued by them

Address Change Form
Form 15 G
Form 15 H
Customer Updation Form for KYC - Individual
Form for KYC - Proprietor & HUF
Application for Financial Rights for Non-Individual Entities - HUF/Partnership/LLP/Society/Club/Company/Trust/AOP
Download BR for existing accounts
Lockers - Joint Hirer
Lockers - Single Hirer
Request Slip for Exchange of Old High Denomination Bank Notes of Rs 500/- & Rs 1000/-
Application form for Demand Draft/Manager's Cheque
Application form for e-age banking channels and change of address
Account Opening Form - For Individuals ( for opening Regular Savings Account, Basic Savings Bank Deposit Account, Individual Current Account)
Account Opening Form - For Non Individuals ( for Regular Current Account, Trade Account, Plus Current Account, Retail Trust Account, Premium Current Account)
Account Opening Form - For Fixed Deposit - New Customer
Account Opening Form - For Fixed Deposit - Existing Customer
Account Opening Form - For Resident Foreign Currency Domestic Accounts
Declaration Form - RFC Account Opening
Application Form for Switching Current Accounts
Letter of Mandate : To authorise a nominee to make, draw, endorse, accept, authorise, sign any bills of exchange, promissory notes, or other negotiable instrument
Account Transfer Form
Account Closure Form
Registration form - For NetBanking / Phone Banking / International Debit Card/ Alert Message Service for Individual and Sole Proprietor
NetBanking Form for Non-Financial Access to Authorised Signatories
Third Party Transfer through NetBanking


Address:-
HDFC Bank
1st Floor,C.S.No.6/242,
Senapati Bapat Marg,
Lower Parel,
Mumbai - 400 013.