Best site to purchase gift cards but with few conditions

Using zingoy since almost 6 months now for most of my gift card purchases, and really appreciate their website’s UI and almost instant delivery of gift cards

Note- Review is based only on purchases from premium sellers

Major pros-
Availability of variety of gift cards
Added cashback for many gift cards
Option to choose from various payment gateways and methods
Almost instant delivery for orders fulfilled by premium sellers
Availability of zingoy gift card in odd denominations of 10 and 50
Wide customer base available for sellers

Major cons-
Non-availability of flipkart GVs
Slow or no response from customer service
High processing charges