App installation error

I am really unhappy with the capitec app. I have been using my phone for over a year and I had a capitec app and I deleted it buy mistake and now when I went to capitec to re-install it for me it does not work and I went to 2branches in springs and fourway crossing they are telling me I must buy a new phone. This is really a bad service because I had an app using the same phone now I cannot re-install and I have never been advised that I need to a pecifil model phone in order to be a capitec client. I am truly unhappy with yours service and I will be moving my bank I cannot struggle so much just to get an app.