Paytm Mobile Solutions — Amount get deducted on service received

Website:

www.paytm.com

On 24th Dec, 2016. An amount of 6626 was deducted from my account towards Paytm wallet. However, the merchant did not recieve the amount and no details of transaction are showing up. Tried contacting Paytm on thier care mail. Contacted them on twitter, asked me to dm them. But then they went cold. This is not the kind of service one would expect, I demand an explanation for this.