Totally poor service from Discovery Bank

I had a Discovery credit card but have not used it for years - just kept it for in case I needed it for an emergency. In the past, when my card expired, Discovery would inform me and arrange for a card delivery at my work address. I retired at the end of March 2017 but retained my mobile number, and never received a notification again regarding expiry of my card and delivery request for a replacement. When I needed it again, it was refused and I discovered that it expired. In the meantime, I still paid my monthly fees of up to R100 per month) to sustain my card service, not realising that it has expired. I then called Discovery Bank (after the change from Discovery to Discovery Bank) with this information and requested that the issue had to be escalated - i.e. that Discovery Bank charged me the monthly fee to sustain the card service while I have not received an updated card. This continued across many calls to the contact centre to request escalation to management to resolve the issue to pay back the monthly fees while I did not have a valid credit card from Discovery Bank, or close my credit card account. After many months of trying to communicate this, I now demand both - i.e. cancel my account AND pay back the fees since my last card expired. My calls to the Discovery Bank to the contact centre in this regard, resulted in a number of negative experiences (Discovery Bank is welcome to trace my calls - I am a retired global consultant in the contact centre industry). These varied from a promise to escalate and call me back (without this happening) to just putting down the phone on me. While I cannot afford to continue paying for a service that I do not receive, this is my last resort before reporting Discovery Bank to the relevant ombudsman.