Avis pending credit card transaction

I have done an online booking on the 8th of Nov, whereby the transaction did not go through, after 3 attempts all 3 transactions went through on my credit card as pending, after emailing them on the 8th I have not received any response to date (22 Nov), 2 weeks later. I have called them on the 16th (after an attempt before that) where by I have given details and it was said that the transactions will now reverse by the 20th and still not reversed on the 22nd, I have phoned again on the 22nd again saying it will reverse in 2 working days. So lets see if my 3rd attempt will be successful! Very disappointing and not booking with Avis again!