Bad Customer service from Nedbank

Can you please explain why Amex, ClientFeedback, Talk@Us, CSSInbound, NCC Card talk to Us, NCCCT just never respond to emails?

Tuesday, 20 August 2019 & Wednesday, 21 August 2019 & Thursday, 22 August 2019 & Sunday, 25 August 2019 & Monday, 26 August 2019 & Tuesday, 27 August 2019 & Wednesday, 28 August 2019 & Thursday, 29 August 2019 & Friday, 30 August 2019 & Saturday, 31 August 2019 & Sunday, 01 September 2019 & Monday, 02 September 2019 & Tuesday, 03 September 2019