Re cancelation of the medical insurance

Discovery flexicare is a **** .they have set up a debit order with my bank account without me approving the mandate ,on top of that the amount they claim is not what we agreed about ,on top of that they didn't insure my son as my dependent .They must actually stop and cancel it ,they are not trustworthy at all .My name is Meleka Anna Motswai and my phone number is *** l .Their refence number is #***#