Superbalist empty promises

I bought a rail from Superbalist. Part of the rail was not delivered. I immediately phoned them and asked if I should return rail as I urgently need it for a work event or will they be able to help me with the missing parts the next day. They promised delivery the next day, so I cancelled my second options. The next day I phoned numerous times and ask for manager to phone as it is a urgent matter. They continue sending mails, but no one takes responsibility. I need to use rail as I have no other rail and I am very unhappy about the lack of management at Superbalist.