Hi @Iain Howe,

Thanks for reaching out.  I can certainly understand your frustration here; let's see if we can get this figured out for your client.  The first thing I would ask is to check your Merchant Service Center to see if the charge has actually gone through.  We want to make sure that the client isn't getting double-charged when trying to pay this invoice.

Next, I would like to know if the client has tried any basic website troubleshooting on his end, such as clearing cookies and cache, trying an incognito browser, trying a different browser, etc.

Let me know and we'll go forward from there.

Thanks,

Lucas