Courier Guy over promises and under delivers then blames the client

I recieved a sms and email from them requesting me to contact them due to the fact that they need more information so that they can delivery my package. I contacted courier guy and was help by the most rude call centre woman who would not listen to me before she told me that my delivery is in order I'll get on a different day, I selected and paid for same day delivery. I tried telling her that couriers guy sent me a message to call them but she treated me like I was a complete idiot. I think courier guy promises these big companies they can delivery same day but in actual fact they can't and then use the fact that the client was at fault to push the delivery to a later date. I don't mind waiting for a package but don't make it out to be my fault, take accountability and apologise when you can't delivery when promised.