Bad Service

I travelled from New Zealand on holiday. I flew from Johannesburg to Durban return. On my return 2 checked in bags were very damaged. I reported it. I was informed I needed to send ID, plane ticket, bag ticket, bank info and proof of purchase. My problem is proof of purchase (which shouldn't factor) this information in in New Zealand. I now no longer have appropriate bags to travel back to New Zealand. I think this is terrible service and recommend that people stay away from them.