In college a friend of mine's phone was 1 digit off of the local pizza delivery place. At first, we tried pointing out that they HAD in fact, dialed an incorrect number, 1 week later, called the phone company and tried to get a new number. They said no. After that we felt we had done all we could do and started taking orders. After about a month, the pizzaria called and volunteered to help us change our number (and buy it from us). 2 days later, we got a new phone number.