Terrible customer service

The flight itself was not terrible. Service was slow and they took forever to clear dirty trays. We actually had to take our trays back to the galley ourselves. The biggest issue was that our checked baggage was delayed when we arrived in Istanbul from Johannesburg. 5 days without our bags. When they arrived at our hotel, permanent marker had been used on one suitcase. Customer service is non-existent. Only automated responses on emails. No customer care number in South Africa. I guess they are only the 'best airline in the world' when you don't have a problem.