Milk vs Car Spares - Moo moo

I recently bought parts for a service from AHK Vanderbijlpark. I am a woman not a man who knows cars, so I asked for a service kit on a Volvo S40. I was sold a very expensive pump of R760.00 which I did not need for a minor service which I did tell the Counter Salesman. I asked my brother to return the pump for me based on the background. He was at AHK Vanderbijlpark today and was told the slip clearly states no refund. But SELLING ME SOMETHING YOU KNOW I DONT NEED YO MAKE MONEY OFF ME just does not sit well with me. I even complained in store about the price but the salesman insisted I would need it and he had no generics only the original.

I can not afford to buy parts which will collect dust because someone wants to make a buck off me sorry. Utterly disappointed that this happens to us as single woman. I feel "******" even "milked" for my hard earned money.