Left in the dark after consignments botched.

I am a desperate customer trying to get answers from this courier company about consignments which were mixed up/lost/late/missing parcels. We have been phoning and emailing all of last week. I have been calling KZN depot since Friday. Not once have I received a return call, despite many promises. I cannot get answers or action at this point. Details are too lengthy for this review. But I have them. The latest "insult" was an email from The Courier Guy asking us to supply video footage of the collection...what????? This situation is appalling, I have nowhere left to turn, no idea how to get any action on their part to fix and resolve this debacle, which has hugely impacted our standing with our sponsors.