Shocking customer Service

Booking no : ***9 I hired a car from thrifty on the 1st of October and to date I have not been refunded my holding deposit . I called them on the 19th to find out what the delay was and the lady I spoke to said she is gonna call the bank and find out what the delay is . To date she has never called me back . I have since tried to contact them and they keep promising to call me back but no one ever does . I keep calling them and they never once made me hold on for 15 minutes . No one can provide me with answers or explanations . I have hired cars from their competitors before and have never experienced anything like this . Their service is bad and their attitude is shocking