Website keeps sending out FAILED orders when its not

[nitskey]

I am using protx as the payment partner on my website.

Whenever a customer places an order, I receive a transaction successful email from protx, but my website sends out an invoice to the customer automatically and it says the transaction has failed so the customers keep on reordering!

 

Basically what I want to do is disable the function of the site automatically sending an invoice to the customer, please let me know how I can do this, thank you