No Customer Service

I rented and returned a car to Cape Town airport on the 12th Nov at 14:00, I left my Garmin GPS in the car by mistake.....I have now spoken to the call center, emailed the call center, been cutoff by the call center and have been promised that they will check the car and return my call....this started at 11:00 this morning...now they cut me off when I call. I am with Huge Telecom and we have made a point of using Hertz until this experience...I will do my best never to use Hertz again and will try my best to make sure that our company does not use Hertz again. The value of the Garmin is about R1500....tell me if the value of that Garmin exceeds the value of this Hello Peter post and your future business?