I'm sure this isn't the case with your father, but there may be a reason they didn't believe he didn't order the pay per views. You can order a show online. I don't have a phone line connected to my DVT box either but I have ordered movies through my account online.
I also have not had any trouble with customer service. The only time they annoyed me was when I was trying to cancel.
I think the big problems occur when a person wants to cancel their service!
He would not have been capable of ordering a movie online. They said that these charges appeared on his receiver when we turned it in to them. They were "funny" about returning the receivers as well. They sent us boxes with numbers of the receivers to put in each box. One receiver box was incorrect. We finally got that straightened out, but I had the feeling the whole time that they were planning on saying that we hadn't returned one of the receivers and charge us for that. It did not happen, but it was something I picked up on.