Bank Of India — atm transactions failed but money not refunded to my account yet 17 working days completed why?

Address:	Guntur, Andhra Pradesh, 522002
Website:	Bank of india

Respected sir/madam, i made a complaint of withdrawing money from atm on november 8, 2018 online on boi website atm failure/refund form and got reference numbers on november 9, 2018 3:51pm. Reference numbers are 091118data2709 and 091118data2713. Atm transaction failure at indianbank atm nehrunagar 4th line, guntur-522002. Once 2000rs debited but cash not came from atm machine but message notified as money debited from my account and again 2000rs debited. This time no message notification but money debited. So total 4000rs debited from my account. I called customer care they said that it is server issue. I go to bank and also fill chargeback form on november 19, 2018. Please help me to solve this issue. Already 17 working days completed till amount 4000rs not refund back to my account i also attaching screenshots of my transaction details. Kindly look into issue and resolve it.