Reading numbers

I'm a little numerically dyslexic at times, but i'm starting to get a bit annoyed at people who can't seem to read phone numbers.

My phone number is one digit different to a local private girls school here in Adelaide, and at least a couple of times a week I get a call around 0830 intended for them. Mine has a sequence 834 and theirs has 833 in the same spot but the rest is the same. Maybe I should put a pointer in the voicemail message.

Today some guy called 3 times. Once, where he seemed to suggest the number he was calling wasn't actually my phone number, then immediately afterwards where I didn't pick up, and finally a good few hours later in the day just to say that he had the wrong number again.