Ordering was easy; assembly was not!

I ordered these chairs after owning similar furniture for my condo in Florida. The ordering process was easy but delivery took 8 weeks. When it finally arrived, I was missing a PVC bar. The company returned my call and said a replacement part was ordered. Hope it arrives quickly.
The sling is very difficult to install and I still have not been able to do it! I will have to pay someone to assemble it and hope I can actually use these chairs. I am wondering if I was sent the correct size! This needs to be made much clearer before the furniture is purchased.