Poor service! Money taken out my account without my consent.

Terrible Service! I got debited an extra R900 on my vehicle finance yesterday. I called this morning to enquire. I got sent from one department to another until they eventually "could not hear me" on the phone due to their lines being bad. I asked if they can call me back as I am a client of theirs. The lady I spoke then could sudenly hear me and rep****: "No, we can not call you back."\ So basically I am more inconvenienced by having to waste my time trying just to get through to you guys. It is pathetic that you take money without my consent and then make me have to chase after you guys.