Unprofessional service and poor communication

I reported breakdown of a vehicle I rented from Thrifty Car Rental(clutch malfunction, flat wheel) last week. I also informed them about my flight time. I was promised that a tow-truck would collect my car and that transport will be provided to the airport to be on time for my flight. However, 30min prior to my flight no one had pitched up - I had to make alternate travel arrangements to the airport, I missed my flight and had to book a ticket on a later flight. During this week I have been contacted by multiple personnel regarding the damages to the vehicle. Almost a week after reporting the breakdown, I have not yet received any invoice reflecting the damages and the liability involved. The company has been deducting amounts from my credit card but have not informed me as a client what my liability is. They are now also claiming that scratches (which were indicated on pre-rental car inspection) are my responsibility. I have taken a tyre waiver but am being told to pay for the flat tyre. No mention is being made about the company reimbursing me for unnecessary additional costs incurred on my behalf for flight. I lodged a complaint on the website 4 days ago