Mission impossible - obtaining your invoice.

It appears to be easier to win the National Lottery than to obtain an invoice from Avis. I have attempted several times to retrieve my invoice online, but the system continuously returns error messages. I have also sent two separate email correspondences to Avis Customer Services department, yet I have not received resolution. At this point, I am unsure what further steps can be taken to obtain my invoice, and it seems that lodging a formal complaint is the only remaining option. It is disappointing to experience such inefficiency and lack of support from a company of Avis’s stature. I urge Avis to resolve this matter promptly by providing the requested invoice and addressing the technical issues on your platform.