FedEx fails me once again

Why is it that everytime I use FedEx I need to experience difficulties with their service.

Item scheduled to be delivered today 18:00 which I was happy with as I needed the item to be used today.

I make arrangements to ensure I am home to receive item then here I am sitting waiting no one shows up.

Then when I call I am told I need to pay 1st, why wasnt the invoice sent to be on time for me to make payments?

And why did no one call me to alert me that I need to pay before item is released?

And what I was sent is not an invoice it's a screenshot of amount that make no sense to me at all.

I am not happy with your service once again.

Regards

Unhappy Sender