****ty service from Avis

So I rented an Avanza for about 30days from Avis/Budget Airport... I returned the car, no issues, just that the tank was not filled up... Couple days later I received my final invoice and the my deposit was paid into my account, along with a thank you message... Today I wake up to a message from my bank saying that money has been deducted from my account and paid to Avis, but no message or call to say why... I call in to the call centre as I am now a bit concerned... They told me straight there is nothing they can do, I need to wait until Monday to have this sorted out... This is disgusting, they are quick to take the money, no matter what day of the week but when we call to ask what is going on we need to call back as customer service only works weekdays, some bull**** that is!