Poor online return service

I purchased 6 items online , 2 items were delivered in drips and drabs. Then i get a notification that there is there is not enough stock of the 4 cannisters i purchased. ( yet there were plenty available) After a few days I receive 1 cannister ( not sure what i was going to do with only one) however, that cannister was a defective one ( chipped on the bottom ) . I tried to return it online and was unable to do so . I called the call center and a consultant said they will arrange for a collection and a refund . Alas not done. I then sent a message to the facebook team and have to then repeat myself multiple times. ( at least they respond and try to help) Now i must wait for someone to call me . I just want to give back the item and get my refund please .