Unorganised debit orders and bad service

I joined gym on the 24th of July 2017 and i chose 7th of every month for my debit to go through. Secondly I was promised 2 months free which I never got. The gist here is the debit issue, September 7th a joining fee of R100 was debited (unauthorized) which I had paid in cash on the 24th of July (my joining date). On the very same month they debited on the 27th (September)

From what the sales guys explained to me, my first debit order was due on the 7th of October which was a lie (made a fool of me). When I went back to complain, the sales person (lady) in Ghandi branch said to me, the reason why they debited on the 27th of September was, when the debit order on the 22nd of September bounced (which I don't know of it). Of which this was a green lie as I didn't get any notification of a disputed debit order from the bank.

Now it's October, because I complained I expected change but unfortunately Gym company surprised me with BAD NEWS, boom debit order has gone through and its on the 25th. What confuses me is; who is responsible for this company disorder, bad service, Incompetence, bad attitude from the sales persons and theft (theft refers to running a debit order which is not signed for) So thus I decided to reverse or dispute the unexpected unorganized debit order from the gym company. I have never had problems before with debit orders thus why I still have a clean credit record. I can't allow my credit record to be spoiled by just a gym which I chose willingly to join! I am FURIOUS!