Parts taking too long, no communication

I am frustrated with Nissan Northwest (Westrand). I have to call them to follow up on a part, which was ordered 25/09/2022. Firstly it takes longer than 5min holding just to speak to someone within the parts department. Then when I enquire about the part, they can't tell me what the delay is. They can only tell me that they will call me back in 10min which they never do! What I dont understand is why they cant tell me exactly what the delay is, in the meantime I have to explain to my boss why my work transportation is standing and I have no idea when it will be running because Nissan is clueless!!