wrong number, but identical name

I needed to have a Gas Certificate for my tenanted property and asked a local Corgi registered person to call my tenant, Will J, to arrange a convenient appointment time. I gave the Corgi man the name and mobile number of my tenant. A day later, the Corgi man rang back and said he'd come to inspect the flat but my tenant was out. He'd then called the number I'd given him and spoken with a Will J who said did not live in that town and had never heard of me. I then set about contacting my tenant, who I'd always found to be cooperative and polite, to find out what had been going on. In the meantime the Corgi man realised that he'd incorrectly dialed my tenant's mobile by one digit, and yet still spoken to a Will J! What a coincidence.