Refused to accept returned cellphone

I bought a Samsung Galaxy J4 on the 17 April 2020, which was meant to be a dual sim as seen online/google. When I got home I realized that it was not a dual sim and returned it to the store on then following day, I was told to return when the Returns section (was closed due to lockdown regulation) is open. On the 03 June 2020, I went to the store and Davita Naidoo refused to take back the cellphone and stated that Makro does not sell dual sim cellphones. When I checked on Makro website it shows that there are dual sim cellphone advertised e.g. Product ID: ***_EA. The following return requirements were adhered to i.e.:

1. it is in its original packaging and condition, including all attachments, accessories and documentation. 2. it is unused.

I found it to be very rude for Davita Naidoo to tell me that I bought something that I do not know.