We pay for there mistakes

Not happy . Ordered items . Not all the items was in the package. I mailed them and asked to send the rest of the items . They then collected the package instead of sending the rest . They then credit my account . Now I have to reorder and still pay the travel fee . They did not refund the travel fee . They say its human error but why must I pay for there mistakes . I did ask to send the rest of the items . I needed this item last week . I still dont have this item . It was a present . Now it's a no present late .