Horrible and no response from Fedex

My shipment was sent from the 07/07/2020 and according to the website it reached on the 14/07/2020. I am still waiting till now for the invoice from customs. I have called Fedex multiple times but I am given the same story. Fedex has moved to a new system so everything is slow. I am told it has been escalated each time. But till now no invoice received from customs. This is unacceptable from such a big company that does EXPRESS shipping! . I have now been waiting for over a week. I have paid an enormous amount for the shipment as fedex has increased its price - to receive such pathetic service. Times are hard as it is and now this shipping company is making it worst With their unreliable service. I even see I am not the only one complaining about Fedex at this stage. I really hope my issue gets resolved as this is unacceptable.