UNPROFESSIONAL AND RUDENESS

I received a call yesterday the 6th August 2024 from Absa collection call centre the lady said that im owing an amount that im not owing then i tried to explain to her that im not owing and she was so rude and ended up telling me that she cant assist me then I asked to speak to the Supervisor she said No and dropped the call. I then called back and spoke to Busisiwe and she said June was not paid which i paid and she advised that i go to the bank which i did and i also asked her for the supervisor and she promised to escalate my complaint to them and that she will send an email and up until now no email or supervisor contacted me. I WANT TO KNOW WHAT IS THAT LADY STILL DOING IN A CALL CENTRE DROPPING CLIENTS WITHOUT GIVING INFORMATION BUT BEING RUDE