Car Service and Invoice

i took my car in for major service on Friday 22 October 2021 at the Soweto Branch in Glenridge, they did the service and asked if i can pay in cash. My problem now is that they said theyl send the invoice via email and they haven't done so when i call the guy who serviced the car "Shotie" he hangs up my calls. I need the invoice so i could claim from my employer and also see what was replaced. Today is the 28th October 2021 STILL NO INVOICE DONT EVEN KNOW WHAT THEY CHANGED IN THE VEHICLE