Indian Overseas Bank — payment problem: person's not responded back till due date of my electricity bill

I have paid my electricity bill for amount 3628/-on 27/feb/2018 at 3.30pm which is due on 9/mar/2018. But i received mail from tangedco that i have not paid. Tangedco told that they didn't receive amount from their iob bank. So tangedco mailed iob dated 8/mar/2018 that to check and confirm whether amount credited to tangedco account or not, keeping me in mail. But iob still didn't reply to tangedco. I have keep on following iob 9times but no reply came from iob.

[protected]@iobnet.co.in & [protected]@iob.in are the people not responded back in critical situation.