HDFC Bank — refund not received

I was to receieve a refund of rs. 2000 and the company said that they have done the refund but i haven't received it has been more than 15 days and when i inquired with the company they said that amount was credited a week ago when i sent them a screenshot of my net banking transaction details of amount debited and credited and said that i haven't received then they again initiated the refund but it has been another week and i'm yet to receive the refund. My complaint is against hdfc as they have no customer care for debit card holders i tried a lot of numbers but some said this is credit card helpline no. Other no. S were non existent