Faulty Samsung s21 plus within 4 months of purchase

I have purchased a Samsung s21 plus from Telkom on the 29th of May 2021 via a cellular contract. The phone has stop working within 4 months of purchase and was booked in at Telkom to establish fault on the 06th of October 2021.The repair centre sent a message stating that the phone has been repaired. To date I do not have possession of the above mentioned device. I have approached Telkom and Samsung to cancel contract and refund payments made so far since I did not have the device or replace the device as I do not want a repaired device. It was established the device had to be repaired due to a product default than of negligence on my side. It is not acceptable that a brand new device at early stages giving me a problem and placing me at an inconvenience. It is already 17 days I am with no device. Furthermore I am pushed pillar to post from both Samsung and Telkom.