Bad customer service skills

Cash crusaders Maponya mall I feel like they don't have customer services skills. Yesterday i went to cash crusaders to buy washing machine and sound bar So on top of washing machine the was extention cord mind you on both machines, the cirds didn't have prices like it's an promotion of you buy machine u get extension cord. Okay right while i was going to pay for a Machine and sound bar. Machine was R4800 and sound bar R850 total price was R5650. At the till i noticed that there's no extention cord then i asked where's it and i got the answer of no u have to buy it aside then we started to debate on how do u display something as if it is on promotion cos nna i choose that machine being attracted on the extention cord that i saw on top of the machines so now u saying i have to pay R110 for it. Then i said then okay fine give me with discounts still they refused then i said okay then let's cancel everything. So they lost R5650 cos of extension cord that didn't even have a price on it I felt like they don't have customer services skills serious