Debit order update

I am really annoyed and frustrated by your service. I just received another call from a lady called Nandipha about me owing the SAME amount that I got confirmation that was reflecting. I cannot be having the same problems with virgin active every month. This is unacceptable. Last time I was assisted by a lady called Richka. She explained that you guys changed systems and it was reflecting on the old system but not new system. She said she will send a request to IT to update. How am I still getting calls about the same amount 2/3 months later. How is it my problem that you guys changed systems and not updating accordingly?