Bad service recovery

Sadly from November 2020 to date I have no proper service recovery. Sent email in January 2021, no reply. My vehicle still missing part after promised effort to get. Highly heart broken that this is how a customer is treated after spending almost R20k after being told cheaper else where?? For job done. And fact that everytime technician stuck in traffic from early morning and only able to arrive late afternoon. Is this the standard that is acceptable to customers? And if technician not supervised parts missing or he has to have his vehicle checked to fix customer problems?? Is that a specialist? I am in a customer service role and have never given this type of service. Lady that was my contact Phiwe has also not made effort reply to messages? Is this acceptable service? When asked to pay done Immediately but wait for what consumers pay for and parts go missing??