overcharged and zero response

I booked a car in January based on the price quoted on the online booking. -Note that when booking through avis etc this is exactly what I have paid (plus fuel)<br> <br> not only has a R288 booking ballooned to R640 (Fuel R141) but there is ZERO response from your billing department<br> <br> Please can you explain the additional fees (except for the refuelling of course)<br> <br> <br> Additional D.W 72.18 10.11 14.00% 82.29<br> Windscreen & Tyre Waiver 24.56 3.44 14.00% 28.00 Document Administration Fee 67.54 9.46 14.00% 77.00 Tourism Levy 0.51 0.07 14.00% 0.58 Airport Surcharge 6.61 0.93 14.00% 7.54 E-Toll Charges Other Agencies 10.00 1.40 14.00% 11.40<br> <br> NONE of these are listed when I booked on-line and the booking was already for drop off at the airport, why are these charges HIDDEN.<br> Note that the booking should have matched my online booking