No a/c received - no email address - poor service

I rented an Avis vehicle through Mango. Accounting, contact and service is shocking!!! <br> a) Despite a promise to do so - no confirmation of booking has ever been received.<br> b) No invoice, account or statement has ever been received, surely a customer is entitled to receive an invoice showing how the amount debited to their card account is made up!!!<br> c) It seems to be a state secret as to what Avis's email address is - unable to find it on the web???<br> d) Interesting to note that their daily free kilometer allowance is half compared to a similar Europ/Kulula deal.<br> <br> Wow this is really \good"service."""