HDFC Bank — ach debit return charges

Address: Kadubesanhalli, 560047

I have been charged 1770/- (590/- 3times) from my salary account stating as ach debit return charges. No prior intimation or communication was done in reference to above stated transaction. What are these charges for! Why are they so high. Hdfc bank has to return this money.

Please help me resolve this. People are losing trust in public banks and now these banks also.
If auto debiting is a service you provide as a bank, then it is your duty to inform me on the charges for the same. Heights of fraud. You must give me a warning that if funds are insufficient you will be charged. Nothing was there.

Please please help me resolve this and return my money.