Bajaj Finserv — even after paying advance emi they are asking for payment

Address:	Ranchi, Jharkhand, 834001
Website:	www.bajajfinserv.in

I am praneet khalkho and my loan no. For consumer durable at bajaj fineserv is 594ecf61040089. I paid advance emi for the month of october on 1st of october via bajaj official wesite for which i got a confirmation of sucessfull payment whose txn no. Is zp[protected]e. Now i am getting calls from bajaj that your emi is due for the month and the reason they are giving that advance emi can be paid only before 22nd of last month dan only it is accepted but it is not mentioned anywhere in the site nor at the time of payment about their term and condition for advance payment. Now they are harrasing me by calling that we cant adjust so you have to pay the amount. Kindly help regarding this that what can i do.