Overcharged on Invoice

I was quoted R347 by Europcar for car rental from 23/12/2015 @ 21:00 to 25/12/2015 @ 20:00.<br> I was shocked that they charged me R715.<br> This includes R95 for fuel and R2.77 E-Toll.<br> <br> I have emailed them 3 x since receiving this invoice on 27/12/2015 and the matter is still not resolved.<br> <br> The invoice also reflects the cra was returned 26/12/2015 at 10:00 which is not correct. My flight from JHB back to CTN left 25/1/2 @ 20:00. The car was returned on 25/12/2015 at 19:00.