Paytm — Paytm account, lost registered number ([protected])

Address:	Saharanpur, Uttar Pradesh, 247001
Website:	www.paytm.com

I have registered in paytm using only mobile number: [protected].
I made purchases of worth rs 72, 000/- and received cashback of around 10, 000/- in my paytm wallet.
I was posted at bathinda, punjab and was using the official mobile number provided by my company, iocl.
Upon my transfer in may'2016, the registered mobile number was disconnected by my company.
Due to which, i am no longer able to receive otp and am not able to login.
I have written mail to paytm customer care but received no response.

This is a very practical problem:
1. Why paytm is giving option to register with only providing mobile number?
2. And, if the option is provided to register with only mobile number, then a mechanism must be available to recover the paytm wallet if the registered mobile number gets lost.

Kindly recover my paytm wallet at the earliest.