abusive service at Shell Golden Highwaym, Poor response from Shell Customer service

I went to Shell Golden Highway garage in Vanderbijlpark Opposite Bophelong township on a Friday night, I parked a diesel pump and one attend was next to my car assisting a truck on the same pump when he was done he just left and went me there and I was there for another 15min without assistance and there was no other car in the garage, so I went to find out why was no one attending to my car. firstly I got laughed at and then I was told why parked there then was told people come and park there all the time how were they supposed to now that I needed fuel, I was very astonished by this and frustrated that how can a petrol attendants who's job is to attend cars at petrol pump among other things did not know I needed assistance so it's normal for their station for cars to ignore empty parking bays and park at petrol pumps for over 20 min for no good reason. As we argued this one of the attendants start threatening me violence and even went as far as to make remarks about my wife who was in the car with me. I called the garage the following Monday to escalate this to the Garage Manager, Named Ishmael who said to me he will deal with it and call me back. Through out the course of June he never called me back, never even sent me an email of apology, I asked for letters of apology from the attendants. I even went to their site to check this he couldn't show me the warnings and he said he'll call me back, again which ofcourse he didn't. When I called him, now he started telling me that I wanted money from him what else must he do, he's guys say they must get letters of apology from me. which only tells me he never acted on the situation as he said he would because had he given out warnings like he said he did and made his attendants realize their fault I do not believe there would have still been such arrogance and audacity from those attendants to even demand an apology from me . I then escalated the matter to Shell Customer complaints, this was even worse for the entire month of July I kept calling and every time the response was "we have escalated this to the area manager or regional manager to engage with the site and call back. The entire July has went by not even a valid response from the Shell to this day, no letter of apology NOTHING FROM SHELL!!!!