Bank Of India — refunding cash

Address:

Kolkata, West Bengal, 7000045

I went to a bandhan bank atm to withdraw cash,
Date:9/12/18
Time:around 6-8pm
I tried to withdraw rs. 8000 from the atm machine, but received a bill saying service temporarily unavailable, thus not being able to receive cash,
Upon checking my balance in the following monday i found out that rs. 8000 had been deducted from my balance despite not receiving any cash the day before.
It has been three days already and i still have not received my cash back.
Please look into this.