No customer support from Discovery Bank

I sent an email query to card services about the migration of my Discovery Card from FNB to Discovery Bank. Despite numerous enquiries as to why my original query was being ignored, I still have had no response after more than a month. I am now asking how to cancel my card so I can switch to a bank that actually has customer service, but I get no response. But I continue to receive marketing emails encouraging me to upgrade to Discovery Bank. I could never trust my money with a bank that treats its customers so badly.