Greyhound inconsiderate on client's

I had a horrible experience with my travel with Greyhound bus from JHB to Maputo. I lost my luggages on the 27th December 2018 and there is still no trace or responses from their email addresses I was given at their office in JHB park. Their landline is not working , I spent more than R300 on airtime and kept on be referred to reservation. No one is taking ownership of the client's stuff.