Miele disgrace

I want to order a spare part. I phoned the company and was informed that they had stock of the part I needed. I was referred to Mr. Alphrus Choga, being the parts manager. He sent me an invoice and I paid. He rep**** during 27/2/18 that he received payment and he is sending the part via courier to my house and it should take one day. I have not received the part as promised. Since then he has refused to answer my numerous emails and return my telephone messages. The call centre keep on telling me that they cannot help me and that I have to work through Mr. Choga. Mr. Coga is a disgrace to his employer Miele SA and the company is disgraceful in not having better service delivery.