There's no point of saying paytm did it.
Someone else might be having those details or
you might have RAT inside you pc. 
Yes! Rodents and electronics dont go hand in hand
Never trust these wallet companies such as PayTm and MobiKwik until there are stricter RBI regulations and an independent watchdog/committee monitoring these companies.
At present they behave like amateur kids with zero customer support and very poor service.
How can PayTM not have a contact number? You have to e-mail them and wait for a response. And they pretend to be replacements for banks.
Is this any way for a financial company to operate? Tell me which bank does not have a customer care phone number?

MobiKwik, I will tell you is even more sad, their customer service reads from a paper "we will resolve your concerns in 48 hours" and it takes 15 days for them to respond back after that.
Paytm customer care : 0120 306 2244
Mobikwik customer care : 094664 46644