Wrongful charged

On the 11th of November I requested my trip was R101 and the driver cancelled when he was at the gate he said he wanted cash, I was then charged R20 for the cancellation fee however that was refunded back into my bolt account,so I then requested today so my trip was R35 they than charged me R15 because of the R20 balance, but now I Keep on getting notifications about trying to take money from my account im so angry at this stupid app and ****y service im going to delet my app im tired