Baggage damaged by Ethiopian Airline and no responsibility taken

Three weeks ago I travel with Ethiopian Airlines from Zanzibar to Johannesburg via Addis Ababa. When my luggage arrived in Johannesburg, the wheels of my bag was completed **********. I followed process, reported it immediately at the baggage counter AND registered the damage on Ethiopian Airlines website. The reference number is ***4. Three weeks later and no word or response. I called the call centre at 15.30 on the 25th of July. They asked me to email to a customer relations email which I did two weeks. No manager supervising the call centre to assist with this issue. It's is distasteful and ethically wrong to damage someone's property and not take any responsibility for it.