Sounds like you'd have better luck looking for a needle in a haystack than finding someone who rented a specific vehicle from one location in South Africa that's on FT.
You might be best to look at the specs for the car online. Look at a few trims and see what you might get. If I had to guess from the plethora of MB cars I've driven here: slim chance of a CD player, very likely that you'll have BT, potentially an auxiliary jack for other inputs.