Worst service at Mafikeng branch

Went in for a 120km service which I paid almost 3k. I was told that they did not change my spark plugs and I had to top up for an oil change. The parts that they changed was for 1k then I the additional 2k I guess it was for their car wash service. I regret having spend my money on such a hypocritical company. They never called me to come collect the car i had to make the call, they only to inform me of what they call special spark plugs. When I confronted the lady at reception she said its unfair for all the clients because my plugs can last for two years and other clients only last for a year. They treated me like I am a fool and I knew nothing about cars.