Why would they give you an appeal? They are not a charity organisation they are a business for profit. If something they are doing is illegal then by right you have access to the courts. Use them.
That's like saying, "Why would you talk to their customer service when you could just sue?" The courts are there as a last resort, not as a default place to settle things. Your statement also implies that there's not a relationship between how one treats their customers and bottom line, which is pretty far from the truth.
The market mechanism should step in before the courts (i.e. they would give you an appeal to stop from losing you to the competition). The problem in this case is that there are no significant competitors.