Horrific Service and Lack of Ownership from Mercedes Menlyn

I usually get everything done at Mercedes Benz Wonderboom where I always get exceptional service. Yesterday I contacted the customer care center looking for AD BLUE for my car then referred me to Mercedes Menlyn as it’s the only branch open and informed me I need to take my permit that I travel with as well as my ID. I did that but when I got there I was rudely informed that I need the company CIPC document that we use in branches and not my own travel permit. How does one use a company’s certificate for personal use???!!! Then the consultant said it’s not his rules, it’s the company’s - what a way to deal with a client’s frustration!! He further referred us to the workshop where there is a queue of cars waiting to be serviced and said we should wait on that queue until all cars are attended to then the will sell us the AD Blue liquid???? This is appalling service!!!