Capitec does not help their clients, they waste their clients' money instead

I have been struggling to buy a text book from Amazon for two (2nd May and 3rd May) days using my Capitec account. I have already purchased three text books from Amazon (on the 1st of May) using my Capitec account, but despite having sufficient funds in my account, the fourth text book purchase is being blocked. I have called Capitec twice to try and resolve this, rather than help me, the consultants I spoke to put me on hold for extended periods of time, and after spending R75 of my airtime I have not yet been helped. I received two SMS messages encouraging me to follow the queries logged from my call, but when I use the WhatsApp number they have provided for this, their system shows my that no queries have been logged. I sent an e-mail to their client care e-mail address detailing my struggle, and no response has been sent, not from a service consultant and also no automated response. I need my text book for the course I started on the 1st of May this year, thanks to Capitec, I have not been able to obtain this text book.