Poor customer service

Bought spares late in December and gave it to my panel beater along with the car that needs ro be repaired, due to December and January holidays it took me longer to discover that the parts were wrongfully supp**** . When I returned it to them the salesman was very rude , unfriendly and unhelpful. They charged me 20% handling fee and I am a respected customer who has been buying from them for years and ever so often we are supp**** with the wrong parts .