When attempting to Top-Up via Sage Pay the Verified by Visa Verification window, is blank, which is preventing the payment from processing.
ContactNow, Sage Pay
In most cases, during the payment process, there will be a flashing pop-up window that has been automatically minimized at the top of the Web Browser page, that is waiting for you to either accept or decline the pop-up.
The Web Browser is set as default to block all pop-ups, to prevent advertising advertisements. It is recommended that you add the following ContactNow URL to your web browser pop-up section - https://app.easycontactnow.com.