Very disappointed

When dropping off the vehicle, i’m Handed an invoice that largely exceeds what the rental rate was when booking on Easyrentcars.com. I couldn’t stick around to argue since I had to catch my flight. They just told me all adjustment would be made based on my Easyrental package price before being charged to my credit card....it was not. It now shows I paid more than double what my Easyrentcars deal let me to believe. Extremely disappointed! I now will have to see what I can do about it from 2500 km away...