Bad Customer Service

I just received the worst service from one of your delivery people. I was supposed to receive a portable Wifi router from CellC today courier through you (RAM). I received an SMS this morning (20-02-2019) and at 13h29, I received a call letting me know that the parcel is ready for collection at my work reception. I was told that I should bring my ID Copy and Proof of Residential. I then asked the person who called me to give me 5 minutes because I was not in the office. When I was approaching the reception I notice the RAM Van parked, I proceed to the Van, found two males inside and greeted them and introduced myself, to my surprise the drive said “ohhh is that you 5 minutes” insinuating that I am later than the 5 minutes asked. I then continued to explain myself that I still have to go to the office to pick-up the documents which might take some time. Taking in to considerations that the driver seemed annoyed already and he literally called me “5 minutes”, I then said I can go pick the documents or you can leave and comeback (before I even finished the sentences), he said “you are unfair”. When I asked him why, he said “you are unfair; I cannot say they must leave”. I tried to explain to him that I was giving him options because he seemed like he was in a hurry and literally called me 5 minutes. Instead of talk with me and resolve the problem, he then ignored me and started explaining himself to a friend of mine who was standing a bit far from us, leaving me standing alone. I left and went to fetch the ID Copy, when I came back, he then told that he wanted original copies. Earlier, when I spoke to the other guy who called me (which I realised that he was the one sitting on the passenger side) he never said anything about the original copies. The argument started, he started telling me that he cannot deliver the parcel without original documents. My argument was that no one told me to bring the original documents and copies. Then I again when I went to pick the documents in my office, he made a disturbing statement to my friend, which my friend voice it out when I came back, he said “people who are working in office are giving them attitude and they do not contribute anything towards his salary”. My problem now is that, he is going around throwing tantrums and giving people attitude because they are working in offices, which is a bad genaralisation to start with. There are people like me who do not give anyone attitude, I do not care who the person is. Can I ask RAM that you train this guy and many others who are giving your company a bad name out there, so that they know what Customer Service is and stop starting uncalled for arguments with customers. He refused to give me his name but he was driving a Ford Ranger Van with registration DH 71 JT GP