Incorrect device advertised and delivered then dragging to collect it

I purchase a phone from FNB and on Thursday an incorrect phone was delivered of which it was not what was advertised on the banking app,

The same Thursday the 7th I called after realising it wasn't the same phone I ordered, I spoke to Marildia Reed and she did acknowledge that it is not what was advertised and will arrange for collection... till this day i haven't heard anything from her... I have been calling FNB for over a week trying to get this sorted, yesterday the 14th i spoke to Dumisane who promised to escalate the matter and after few minutes i received a call from Zanele Khumalo (customer service) who did not show any remorse about the error and my rights as a consumer and kept emphasizing that it is a human error and non can be done rather than canceling the contract and arranging for collection, I have been calling fnb for over a week for the incorrect device to be collected and still not winning