Travel with British airways and have your stuff ****** and broken bags

On the 25th of September 2018, I was on British Airways Flight 6414 which left CPT at 13:44 and arrived in JHB at 15:31, after I picked my luggage I have found out that the lock of my bag was broken and stuff ****** from my bag. Some lady at BA luggage centre, said I am send me them an email, which I did and since then I have been sending emails to them but no response at all or I get a computerised email which is not clear. In the meanwhile, my travelling bag is broken and my stuff have been ******. No one is taking responsibility at all.

Please assist in this matter.

Thanks, Themba