FedEx Invoice Concerns - Potential Overcharges and Security Red Flags

I recently received an invoice for customs duties and VAT on an order shipped to me by FedEx. The handling of the charges and payment instructions have raised some serious concerns, and I’d like FedEx to address the following:

1. Draft Invoice: The invoice provided was labeled as a "draft," which is unusual for an official billing document. Am I supposed to pay on this, or is it legitimate?

2. Edited Document: After downloading the invoice, I noticed that the reference number was added via PDF editing software. Why would this be done, and does this compromise the legitimacy of the invoice? It seems as if an additional false charge has been added, and once I pay, the agent will keep this money for himself and thereafter process a final invoice with the correct amounts.

3. Conflicting Reference Numbers: The reference number on the invoice is different from the one the agent provided. Why the inconsistency, and which one should I use for payment?

4. Banking Details: The bank account provided does not match what I would expect for FedEx, and I'm asked to send proof of payment to an email address as they are supposedly experiencing issues receiving POPs directly from the bank. Could FedEx clarify the official banking details and email address for payment confirmation?

5. Ozow Payment Link: I was directed to an Ozow payment link. As far as I know, FedEx does not use Ozow. Can FedEx confirm if Ozow is an official payment method for customs fees?

These inconsistencies are concerning, and I would appreciate an immediate response from FedEx to clarify if this invoice is legitimate and safe to pay.