Paytm is always my first choice when it comes to recharge. I am using paytm from almost 2-3 years. and it was great experience.
when I started using paytm. I was little scare that is this site a trustworthy or not. but after 1 year of experience I found them genuine and trustworthy. the alway give what they promised. I they dont. then just email them. u will definiatly get your problem solved instantly. as they have very good customer support too.
but when it comes to shopping. I am not sure about it. as I just purchases just 3-4 products. because I heard that they dont always give genuine product. but in my case I always got genuine products.
at the end I would say its a must have app in your smartphone. if you want to save some money from your recharges and shoppings. thank you