Discovery Bank ignores partially deaf person

When my credit card was moved away from my banking profile, I cancelled it via the original bank route which gave it to me, i.e. FNB. Subsequently, Discovery Bank have kept the card open and keep adding charges, even though the card is no longer in use and REPEATED requests to cancel my card. However, as concerning as that may be it pales compared to the disgusting service offered hearing impaired persons. I am forced to PHONE in my complaints and queries, despite being hard of hearing, and when I request email follow up and a contact email, and I use that email, I get an automated reply telling me to phone and there will be no written response. How does a 80% deaf person communicate over the phone, Discover Bank, or do you not care? Besides this gripe, I am following up with both the SA HRC and the Deaf Council of South Africa for this shocking treatment. Of course, a month ago I sent a mail to Discovery Bank telling them this, ignored, not even the simple courtesy of a reply, then I phoned complete with my voice recognition software in place, and the agent PROMISED to call back the same day. Now, a mnth down the line, nothing - except yet another email adding charges and telling me my (cancelled / unused) account is on hold.