Paytm Mobile Solutions — their lousy customer care

I faced an issue regarding my grand dad’s card being used for a paytm purchase as shown on his credit card worth 20, 000 rupees but i have been struggling to get details of what the amount was used to pay for. It’s been more than 18 days and their customer care just doesn’t respond. There is no way to dial helpline on behalf of someone who doesn’t have a paytm account. The customer care responded twice in these 18 days with one response about a transaction worth 1699 and completely chose to ignore giving me details of the remaining 18k rupees. Haven’t encountered a more unprofessional customer care.