Sunglass Hut Run around

My husband purchased Michael Kors sunglasses in Feb 2024 from Brooklyn branch in Pretoria. This last week (August 2024), the lens fell out whilst cleaning the sunglasses. I called the branch, they said i should come in and fill a warantee form. I went into the branch on Thursday, the staff said i should consider buying a second pair at 50%. I refused this option. Then indicated i should email/call the repair line as the warantee does not cover lenses, only the frame is covered. I then emailed them this morning ( ***) and my email was deleted without reading. This is unacceptable. The glasses are 6 months old and I want it either replaced or repaired. Surely this is not how customers get treated, this cant be the 1st incident. What is my recourse?