Call them, and demand that your complaint be escalated. Call back daily until this is fixed. Unlike emails which can be disregarded phone calls cost money to process. This means that the FOSS community can impose a financial cost on non-compliance without going through the courts.
I just got off the phone to HTC Australia, and apparently they'll be getting in touch. If everyone did that ...
Only a copyright holder can bring legal action in this case. If you're just a customer, you can't bring action by yourself, as you're not a party to the violation or license agreement between HTC and the copyright holder(s).
If you buy a copy of a copyright-able work, you are a licensee. The "copyright holder" is the person who owns the legal ability to specify and grant the rights under which the work may be copied.
In the UK at least you are looked on far more favourably in the event that something does go to court if you have a paper trail of having made reasonable efforts to find a solution prior to going the legal route.
"Just bring legal action" - sadly, for most people, 'just bringing legal action' is not quite as simple as you make it sound. Not least in terms of expense.
I just got off the phone to HTC Australia, and apparently they'll be getting in touch. If everyone did that ...