Improper and Unprofessional business done at Fauche

I just had the worst experience at Fauche motors in Sandton with one of the head guys named Mohammed. I myself have a dealership and a car spotter. I had a set in stone deal with them for a car I was selling for someone else. I personally fetched the vehicle from roshnee and brought it to them, signed all the paperwork and handed them the car and keys. All that was left was for me to make the invoice and them to do the payment. As soon as Mohammed found out who the owner of the vehicle was, he canceled the deal after I had already left the dealership due to personal reasons with the owner of the vehicle. Non of that had anything to do with me and my business nor was he dealing with the owner, he was dealing with me. It was extremely unprofessional on their part and a waste of my time and money. Now I have to go back to fauche to fetch the vehicle and transport it back to roshnee. This was extremely unprofessional and unnecessary. How can a business work in such a manner??