The bill just needs the correct account number and address.
You don't get to just stipulate new conditions for paying your bill. If it's not in the service contract that your giant name has to be spelled completely on the bill for it to be payable, then that condition doesn't exist.
Are you a lawyer with expertise in Philadelphia commercial law of the 1950s? I'm sure not, so I wouldn't want to take that fight. It was apparently easier for the company to just write the guy's name correctly.
Or maybe Wikipedia is wrong, or the source was bad. You have to pay to read the 1955 article and I can't be bothered right now. Citation 16 below if you're interested.
You don't get to just stipulate new conditions for paying your bill. If it's not in the service contract that your giant name has to be spelled completely on the bill for it to be payable, then that condition doesn't exist.