Debit my account without any correspondence

In the month of December 2017 I had a debit on my account from iWYZE. I returned the debit and then received emails that due to my debit being returned my policy is cancelled and I have no cover. I emailed them twice to contact me but without any response. I then saw an add on Facebook regarding iWYZE and left a comment. The day after they rep**** and got someone to contact me. I was busy and asked the lady to contact me back in 30 min but she never called me. I then complaint again on Facebook and got a call from Princess Msidi. She then told me that Mutual and Federal change their name and that is why they debit my account. I told her that I never received any correspondence regarding the change and that Mutual and Federal debited my account as well. She kept on telling me that they did send out a correspondence. I asked her then to speak with her manager and then this person was in a meeting but she will get them to contact me. This happened at 14h09 and until now I haven't received any call from the manager. If this is the type of service iWYZE delivers then please pay me back my installments since I started in 2006 as I'm not at fault and it was my legal right to reverse an unauthorized debit on my account.