Engen Rowhill Motors fails to resolve complaint of their fault.

Terrible experience at Rowhill Motors. I filled my tank with 95 and asked to attendant to check water, oil and tyres. He came back stating that I need a pint of oil, I then said its fine I will throw in oil myself. After he was busy checking water, I saw the attendant with an empty oil container that he just threw in my engine. The oil he threw in was a 15w40 multigrade. The oil I am using is special 5w20 Fully synthetic base. Its common sense to not mix oil, especially mineral and synthetic. I confronted him about it and asked him to call the manager/owner because he must incur the cost of draining this mix of oil and replacing it with what I had. I was merely shut down by an arrogant owner/manager that simply told me that he knows everything about oil and even threw in his many years of experiece at CAT, which is irrelevant. This cost me now R1170 to replace the oil, filter and flush the engine, and they simply refuse to take responsibility. I spent R12 000 pm at this station on fuel my delivery vehicles and personal vehicles. I will never ever go back! DONT SUPPORT THEM!