Why do you think those letters in the mail can be ignored? They are tied to your license plate and that is serious business. If you don’t pay traffic fines, the fines go up and up and Then they involve the criminal justice system and you have to show up in court and it’s all just very ugly. Oh yeah they can suspend your driver’s license over it too, There’s no way to get out of paying traffic citations.
You must use your Google voice phone number often enough for them not to disable it. I had a Google voice number. Used it infrequently. They disabled it.