Bad service and non compiance/********ly debitting client account

I would like to express my deepest dissapointment in discovery bank.In 2017 I have a life policy with Discovery and they informedthat if i open a bank account i can buy my healthy foods on this card and ill get points and rewards.At the time I worked for a broker who represented discovery life,investment,insure and all other products.They delivered my card but Discovery bank was not launched then.Now 4 years later i recieved an email early this year stating R100 is outstanding which I owe to discovery.4 months later i get another email stating i now owe them R1200.I posted on the discovery facebook page and they informed I must inbox them and so i did and left my contact details.They never called me and a month later my bank inform discovery bank tried to debit my bank account for R500.According to my knowledge a client must give written consent enable to deduct their account.I never signed a debit orderdocument but discovery sent a request to my bank.How they manage to do that,i do not know.I think this is very concerning to all clients to be vigilant if they want to join discovery or take out any of their products.Seems like Discovery is just ignoring my callback request.I tried callingthe call centre and when i gave my details the agent just hanged up.I think the best option is to report this to the ombud to get this resolved as this matter cannot be resolved internally and I am getting the worst service i have ever had with any company.in the meantime my credit record is suffering because of this matter.Does anyone else has such problems with Discovery?