Yes it is, everyone isn't the same, and I get what you're saying, in the dictionary it's "Chok". That doesn't mean everyone speaks the same, something you aren't getting. People say Cha[l]k, despite how you feel about it, they do, and again, unless you're me, how can you tell me I'm wrong and don't hear what people say?
York is spelled in the dictionary, the pronunciation in the dictionary reads "York", yet people still stay Yawk, replacing the O and the R with an A and an W, people have their own accents. Again, unless you've been here, and we have the same set of ears, you can't tell me I'm wrong.