Inaccurate Billing and Very slow to resolve queries #***

I rented a vehicle initially booked from Monday 1st Jan 2018 - Sat 06th Jan 2018 and funds were withheld on my cheque card. Returned vehicle before 12pm on Friday 05th of Jan 2018. By Monday the 8th of Jan18 my contract was not closed. I followed up and was told the billing was not done because there was power failure all weekend. The invoice was sent on Tuesday 9th of Jan2018 - then discovered that I was billed till Saturday the 6th of Jan2018. On the 14th Jan2018 Avis charged my account with the invoice total. Of which by then - the funds on my account were still not released. From Monday the 15th of Jan2018 till today. I have to call Avis to follow up their internal procedures and no one has the courtesy to call me and provide feedback.

My invoice is wrong. My funds are still frozen.