this is directed too all. you do have control if the company you employ to do your deliveries stuff up too many times  then  change companies.  if your happy with the company you employ to do your deliveries then keep them.

maybe think of the buyers   , why should they wait a so long for a parcel that prob is half the price from china when they get here at the same time in a lot of the cases.  think of the buyers not just your defects.