Thanks for interested in this question.
If you have place order and after few moment service prices are gone down, we are unable to Cancel/Reject/Refund until the order status changed from our source or supplier. Because many services are connected API that was an auto process to source or supplier, or we may we already process your order and service prices are changed at any time.
So, it never worries about this case. However, we may try to help you but not guaranteed that we can Cancel/Reject/Refund for the above case. You may Contact Us if further assist requires.
We hope, we have best answered here.