Tamil Nadu Electricity Board [TNEB] — payment paid and debited in my bank account but not credited to tneb account

Dear sir
On 22.8.17 i tried to pay my brother's house electricity bill of rs 1010 /- through my debit card (Canara bank). When i first tried i did not get any reply and tried for the second time and immediately i got message in my mobile that a n amount of rs 1010 got debited and there is no credit in tneb account which shows that the bill is stiil pending. On the same day evening i took mini statement of my bank account and found that the amount of rs 1010 got debited twice. Again on the next day i found the one of the above amount of rs 1010 got credited to tneb account against the bill due and the fate of the another amount or rs 1010 is not know,. Again on 24.8.17 i tried to pay another bill of rs 290/-through my debit card and got the message that the transaction failed. But unfortunately this amount also got debited in my bank account without any credit in tneb account and on 28.8.17 i had to pay the above bill through cash at the counter.. Till date i don't see any reversal the above two amounts via rs 1010/- and rs 290/-. I have even given a letter to my bankers and no reply has come in this regard. Please help me as to how i can get my above payment back.
Name of the consumer is n ramasubramanian (My brother)
Consumer no [protected] rs 1010
Another no :[protected] rs 290/- both at chitlapakkam chennai-600064 electricity office