Bad customer service

Everything went well till I got to the cashier, she seemed very irritated while assisting me to pay with a bad attitude then because I wanted the bed I continued to purchase then when I got a home the headboard is broken, had to go back and exchange it, then later on when I was assembling it end caps are also missing, I’ve emailed the store about the situation and provided them with my address, what amazes me is that they saying for their staff negligence I should pay for the delivery fee to get the missing parts or I should come to the store to fetch it...