Emails not being sent properly for post payment

Hi,

I have given separate content for the mail that needs to sent after the payment and the mail which will be sent after purchase(no payment).
The problem is even after making the payment, the user gets the same email saying he has purchased but not made the payment. So please kindly let me know what can be done to solve this problem.

Thanks.

https://www.ads-software.com/plugins/wp-ecommerce-shop-styling/