Store Policy inconvenience unfairly treated

I Bought a Garmin Fenix 5plus Orange and black, for R12949.07 at the store 18/08/2018. I had a problem with my battery at first then it was sent away to Garmin and a week later I received it back excellent service from Garmin. The only thing I did not like is being without my device as i had to run with my phone. Two weeks later my down button is starting to get stuck everytime I press on it , very disappointing as I paid a lot money for this watch it not like a few hundred rand. So I take it two days ago into the store in Canal Walk, the consultant tells me it must be sent away again I was like MUST I WAIT AGAIN for my device he just says unfortunately I felt so angry as I paid so much money for this watch I have the cash receipt and the watch is in an excellent condition as I look well after my stuff. I am so angry that I must be once again without my device. I mean I bought the watch from Cape Union Mart, what happens in the background that is not my problem the sale was made at Cape Union Mart why cant it be sorted out now the CUSTOMER must wait and inconvenienced. I want this sorted out please ASAP. I always support your store and feel its unfair.

Regards