Dry Ice International fails to deliver

I have ordered dry ice twice now, ahead of time, for delivery in Hilton, Pietermaritzburg. Both times the courier did not deliver as promised and both times Dry Ice International were very unhelpful, basically saying they have nothing to do with it, the courier is at fault and they will ask him to phone me, which he didn't do. I would expect a company to deal directly with the courier company and resolve any delivery issue directly on behalf of the customer, not leave it up to the customer to keep following up and hoping the courier would contact them.