Overbilling, not honouring existing contracts and early debits with no notification

For the last 3 months Bestsecure has been debiting extra off my account. When querying this I was met with complete hostility. No one can help me as everyone is on leave!! I am a client liaison officer myself, which means you are constantly on call! Are you telling me that absolutely no one is equipped to deal with customer complaints? Clearly. Bottom line is, we signed a 2 year contract at a fixed amount, in the last 3 months they have debits extra off my account without notification or authorization. When querying it, I was told the consultant should have made a note, you know what, as the bookkeeper you should make sure you bill according to your contracts not just thumbsuck! Secondly, I understand its the festive season, although Bestsecure have pretty must messed that up for me, incurring me additional financial charges. I know how stop orders work, they get loaded onto a streamer, no accounts department physically logs a debit off an account. Any bank will tell you that, as did mine. But the January 2018 debit was taken off my account on 19 December 2017 with an excuse that it is the festive season and they need to wrap things up!! Rubbish!!! it's on a streamer. If that is the case, how come last year my debit went off normally? The fact that these people are not even registered with SAIDSA or PSIRA is alarming, because they are literally just taking your money and running! The actual patrol and service leaves much to be desired, I NEVER see them patrol my area, despite all the promises we received when signing up. I would never suggest this company to anyone in future.