Appalling customer

I bought an Android phone for business use. And when we got to the shop we asked if it's an Android phone and if it'll support our app. The shop assistant said if it's an Android phone it should. When trying to download the app, the phone did not support the particular app we bought it for. When we took the phone back to the shop about 45 min later we were told the phone cannot be exchanged or upgraded to a model that'll serve our purpose. In addition to the fact that we had a phone that did not do what we bought we bought it for, I did not appreciate the manner in which the staff handled the issue. The manager was so condescending she ended up shouting at us. Treating us like illiterates of some sort. The humiliation in front of other customers I did not appreciate. For a Foschini Group shop I am appalled by the level of customer service one received.