@Mike701
As every big company they use some Customer Service Software, which is useally based on a "ticket system", it can even create automatic responses to a question (and will be more in future, as those system are "learning systems"). The more Artificial Intelligence build in, the less change to get a satisfied answer.
Keep this in mind when sending a question, otherwise you will get frustrated. At Twitter are human beings (still) answerring your private message, but for how long ?
Best regards,
Emiel