Answer
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If you visit https://business.paytm.com/ site for merchants you will find the following support numbers:
Merchant Helpdesk: 0120-4440-440
Bank, Wallet and Payments: 0120-4456-456
You will probably enter the IVR maze. Good luck with finally getting to talk with a live human.
Try dialing 0120-4440-440. It is the number of a helpdesk for merchants. You may have to maintain patience to get through and talk with a human. Better send off an email and let them respond. Hopefully, they should include another phone number in the mail or they may even call you from their side.
You can try 01204440440 or dial business customer care number 8076108221. I feel getting through on the phone can be a headache. Hound them with twitter tweet, facebook post and email.
If you do phone you will find that it is best to phone during office hours starting 10 AM.
Call on (0120- 4888 488) from your registered mobile number.