I found a house decoration designer, and I don't need him anymore. Will he haunt me?

No, the decoration company itself provides you with a service. If you don't choose him, you must be dissatisfied in some ways. If it is really his problem, you should not choose him. If it doesn't exist, it will haunt you. I will contact you twice at most to ask you why. But there is no rogue designer you found, so you can't guarantee it.