The routinely blocked number

Part of me feels bad for doing it. But it's kind of in self defense really.
A good customer, I'll call him Cloyce just to give him a name, is a nice guy. He never argues price; indeed he always thanks us for our good service and gives us a decent amount of business. Yet he has one flaw: he's a worrywart. When he leaves a piece of equipment with me he calls constantly, in the range of every couple of hours, checking on its status until the job is done. If he drops off something Monday morning and I tell him it'll be ready Wednesday, he begins calling Monday afternoon.
I've asked him to not do that. He's always been very apologetic when I have, assuring me that he trusts me and likes my work and knows I'll call the minute I have him good to go. And then he promptly calls two hours later.
This is where I feel a bit bad. Thanks to the miracle of modern technology whenever he leaves something for repair I pull out my cell phone, go to my contacts list, scroll down to Cloyce's number, and block it. When his job is ready I reverse course, unblock it, and call him.
I suppose I should not do that. But a fella gets tired of running to his phone or struggling to get it out of his pocket only to see Cloyce's name there when it rings. It interrupts the flow of work and simply irks me.
Ah well. No doubt there are worse problems in the world.