DAMAGED GOODS, NO ASSISTANCE, ********* SERVICE

I purchased 225 units/pieces of stone cladding from Stone Library in Gauteng, the delivery arrived and the crate it came in was clearly dropped/damaged. Some of my Cladding was broken right through and other's were dismantled. They allow for 6% breakage on any sale but 20% of my order was damaged. Only 180 units were in good condition and 45 were broken/dismantled. We took all the dismantled pieces back to them to get 45 whole ones, after a huge argument they agreed to only give is 35 units.. How am I as a consumer able to calculate a whole lot of broken pieces to be 45 whole units? So as a consumer I paid for 10 extra pieces that I never received, their argument is but how do they know I didn't use it elsewhere?? I find them extremely *********, unprofessional and just plain rude. We even sent them photos of the delivery before we opened the crate to show them it is broken, we invited them to our house where the 180 whole pieces were placed on a wall to prove we have not used an extra 10 units.. to no avail. I just feel they are very friendly to get your business and once you've paid them A LOT of money all goes down, from their attitude to their product, VERY DISAPPOINTED!!