Avis - quick to take your money - not as quick to refund it!

<p>I recently made an online booking with Avis which I had to cancel. I have now phoned twice requesting a refund. The first time the operator explained that the systems were down - I understand this - I am reasonable. She promised to mail it later in the day which she didn't. I phoned once more yesterday and it STILL has not been sent through. Honestly this is becoming unacceptable!</p>