This situation is not normal. I suggest you call the department assistant, because he sent you a message. It's been another week, but don't tell HR yet. Tell the assistant politely that you just want to make sure that if you really want to go to work, you can make relevant preparations yourself.

If you call HR, if there is any information asymmetry between them and the functional departments, it will lead to unnecessary misunderstanding in case of misfortune, which is not good either.

Finally, make sure that the phone is really a company phone, and there are some strangers in the name of recruitment. Be careful to sail for thousands of years, hehe.