UNACCEPTABLE SERVICE!

Totally unhappy with my current experience at VW Menlyn. My Polo Vivo radio computer was faulty, resulting in VW ordering a new radio in December 2019. With no follow up calls from VW or informing me where they were in the process. I had to pick up the phone every time to find out whats happening and even then no one will get back to me after leaving numerous messages. Atfer following up weekly I was informed that the radio in finally in South Africa and will arrive at VW Menlyn in 7 February 2020. Yet again not hearing anything from VW I called only to get a different story. No all of a sudden the ETA of the radio is gone and VW SA is waiting for suppliers before they can send a radio. How does this even make ANY sense?????? And what do I do about this???? UNACCEPTABLE!!!