Bad service! First, the delivery is made more than...

Bad service! First, the delivery is made more than a week later than the agreed delivery time. After calling 3 working days is brought forward. You will then receive an email a day before delivery about the time frame between which they will arrive. Half an hour after the expiration of time, you look online again. Would it have been delivered but not to me and there is also a shortage.
If you then call it is said that it will not be delivered today. If I say something about it that that is not the agreement, the employee will say I am going to transfer you to the relevant colleague and then it will just hang up!