Over charging and unauthorized debits

On the 25th April 2020 I requested a ride back home linked to my bank account the fee was R21 when I went into my bank statement I noticed that i was actually charged R45 i then went back to Bolt app to double check the cost and it still shows R21 and a message stating that on my next ride i will not be charged it will come out of the balance that i was charged extra and i have 30 days to use those funds i was not happy with that as i was not going to use the app anytime soon due to lockdown plus i had a stipulated time frame to use these funds which didn’t make sense to me. I then reported the matter and was handled by a gentleman called Kenty he then assured me that the funds will be credited back after waiting patiently for the response on 28/04/2020 Bolt went back into my account and and debited another amount of R21 without my authority neither did i use the app i went back to support to ask what was happening and i was handed over to another lady by the name of Refilwe who aslo assured me the refund will be credited. On 29/04/2020 I received a credit of R21 i went back again and sent screenshots of my bank statement and asked what is happening and demanded proof of authority for going into my account on the 28th without my consent as i did not request or use their service i then received a response from Refilwe stating that she does not know anything about the last transaction now I don’t know what else to do i have spoken to a family lawyer regarding this matter as it’s now getting out of hand it’s not about the value of the amount it’s about integrity and the safety of my finances and when i ask for the manager to handle this matter i end up being transferred from one person to another help