KLM is not refunding me for my delayed luggage

Worst service I have ever received and will not travel with them again. I arrived in Germany from South Africa and they said my suitcase (check-in) luggage. I provided the address I was staying at in Germany. Instead of sending my bag there, they sent it home (to South Africa) by mistake- so, once I was in Europe for 6 weeks with no clothing or toiletries. KLM has not refunded me for these 6 weeks of additional purchases I had to make. I also had to pay an additional fee for the internal/ smaller flight I did - the check-in luggage - the one suitcase I had was charged for. KLM still hasn't refunded me for this either. Their call-centre agents put the phone down on me and were very unfriendly. The codes on their call centre menu are also not working.