Poor service from Bolt

I took trip with my daughter on 24 May. She downloaded the app on her 2nd phone and we loaded my banking details. Both of us were using bolt for quite some time.On that night they took 11 transactions of my account apparently testing if the banking details are valid, I mean really whyso many and until today NO REFUND?? I have been contacting them numerous times, no joy. Is there someone in that company that can acctually do their job and process my refund. The bank statement and all other details have been provided, really this is poor services. Using Uber now fed up!!