do the needful

It has been a long day. Your mobile phone bill shows an amount due of Rs.5000/- so you call customer care. After a long wait, Sheela wants to help. You explain situation, tell her the bill is wrong, it cannot be Rs.5000/- and demonstrate that in the last 5 months the bill has never been more than Rs.400/- Hence, the bill is wrong. She puts you on hold and some 'n' minutes later reports that there has been a mistake. Your bill was sent to one Mr. Balan and his to you. Promises to rectify the situation and therefore... do the needful.