Uber Driver/changing price after dropped off.

I have requested uber and the changers were R124 , the driver went in the petrol station all of the sudden after drop off the fees were reversed and I was charged R172.00.I felt like i have been ******, why must I pay for money/ time when the driver entered into the petrol station. I am so disappointed with the uber because i pay with the debit card, they can do as they like in my bank account. My travel date was 27January 2023. I would like this matter be invistigated and given feedback .