Damaged bag & no assistance from British Airways

I travelled with British Airways on 01 June 2025 from Toronto to London Heathrow and then Heathrow to Johannesburg (Ref no. ZHRQXA). However, upon my arrival at OR Tambo International ON 2 June 2025, I found my suitcase totally damaged and I immediately went and reported the bag (Ref no. DPR JNBBA35690/02JUN25/0616GMT). However, to date I have not heard any response from British Airways. I have tried sending emails and contacting their representative office in Johannesburg, but to no avail. My suitcase was not even 6 months old