Counting the months to finally close my account with them

Investec sells itself as a premium bank. However, depending on them for anything is, surprisingly, a source of headache. I had a problem with my login access to the app, and wrote to my manager, Collen van Standen, who quickly dismissed me and said I should contact customer services (he had done this other times. It feels like he’s distraught whenever I contact him - which isn’t even that often). When I voiced my concerns, his reply was passive-aggressive rather than humble. Anyway, I decided to overlook this unprofessional exchange of emails and tried messaging not only customer services, but also Instagram. Surprise surprise: it’s been a week and no one contacted me back. In fact, people (including Collen) keep insisting I should call their hotline, completely oblivious to the fact that I have a hearing deficiency. That’s not only unfitted (I’m the client, so I should choose my preferred means of communication, right?) but also rather offensive. They pride themselves in being premium, but I have 5 different bank accounts in different countries and this is by far the worst bank of them all. Luckily I’ll leave South Africa by the end of this year and won’t have to deal with Collen nor anyone else from Investec ever again.