Bosch Home India — against bosch company's demo man

Address:

Tonk, Rajasthan, 304001

I ordered bosch washing machine wak20267in and the demo man of company came to set the machine, he sold us other pipe of 700 inr for machine fitting n left the original company pipe which is came with the product so i wanna know from company that, is it okay or fraud?
If company's pipe is not useful for product then, why company selling or charging it?
Demo man from bosch company is mr kaluram prajapat from kakodd area, rajasthan and his office is located in jaipur, raj.
Please resolve my issue as soon as possible.