Incorrect charge

I was billed R168 for a 3km trip i made one stop during the trip (5min) but should be billed accordingly.I usually take these trips often the most I pay is R40 I have not received a receipt on the app instead its been sent via email.I am not even receiving any more responses they told me i cannot adjust the receipt once the trip is ended but I am not requesting for adjustment I need the valid receipt for the trip that they keep avoiding. I was also requested from them where exactly I stopped during the trip, how relevant is that when the app on their system should have a recording of it. all of this is not adding up especially not receiving a receipt coincidently at the time of an incorrect charge.I might have put in a differnt address on the end trip but should be billed according to base fare distance and time