No service from fnb and they debited me twice in a row for the same service

I have a huge problem with Fnb , been calling and the assistant can't help me they transfer me from one consultant to the other for the past 2 days, went inside a branch Ann's they insisted I use their telephone banking even though I insisted I wanna speak to a consultant coz I've been trying to get help on the phone with no luck regarding my loans that I was debited twice in a row, and they said I need to call, this is really frustrating on top of it all, there's people debiting my account that I don't know, advice what I must do, I'm irritated