Terrible customer service

They sold me ceiling board,later that day they were sold on half the price, i requested them to give a little discount since I bought from them, still having a till slip, they insisted that I hire a transport and bring them back, rebuy them, then get transport again to deliver to my place again, on top of that their ceilings were not one batch inside one box, the glue they recommended is not the right one, now my cornice is held by the *****s which are visible, what a terrible experience, that is the last time they saw my foot in their store, including my relatives