MTN STORE PAVILION - malfunctioning iPhone 8?

To Whom it may concern, I called through to your call center on the 01OCT18, and advised them that i am now having issues with the iphone 8 device that i took out with this store and know that i have to take it back in order for them to assess it. As i dreaded going back to this store following the poor customer service as mentioned above, i asked your call center agent is there any other way i can go about doing this as i want to avoid going to this store, unfortunately that was not the case so i took it the same day (01oct18) back to the MTN EXQUISITE Shop 170 Pavilion with the follow up number of ********** 101 It is now pass the 21 days in which i was told i would receive a response on my device. Since i have given my phone in and every time i call this number there is a ringing tone but no answer. Even the person that took my details Emanuel, i have called him numerous times with no answer to my calls. ********** 000. can i have an update on my phone? MTN has very quickly deducted my account for R750.00 , but i have no phone? AGAIN, where is the customer service?? Can i have someone of authority contact me soonest! i hate dealing with this store and i completely regret taking a contract out with this store, but i find myself going again and again to this store with issues and no customer satisfaction!