Outstanding payment for Uber ride

I am incredibly unimpressed with Uber. On February 4th, I booked an Uber home from Town which the Uber fair cost R139 at the time that I confirmed the Uber. I split the fair with a friend and the corresponding amounts came off both our bank accounts. The following day, the Uber app tells me that I have an outstanding payment of R175 that needs to be paid. When I click on this “outstanding payment”, it takes me to the receipt of a ride that amounts to R244,50. I am extremely annoyed that the cost of the Uber increased after I confirmed it at a price of R139 (which reflects in the past trips on my friend’s app since we split the Uber), while it reflects as R244,50 on my app, for the SAME trip home. I have tried contacting Uber to find out where this R175 outstanding payment has come from, yet no one is answering my queries beyond the automated responses. In addition, Uber is trying to debit my bank account for the payment or R175, which keeps rejecting due to me deliberately keeping my bank balance below R175 as I do NOT authorise this payment. Due to these bank rejections, I am being charged fees for declined transactions as Uber has tried to debit my account twice. Please can someone assist me in this matter, urgently.