Microsoft uses Arvato to handle the payment and delivery of Windows 8, just like they did when introducing earlier versions of Windows. There's really no reason to blame Arvato, because they did what were supposed to do: deliver what you ordered and what you paid for.
If you're unhappy with Windows 8, you can only blame Mixrosoft for making it and yourself for buying it without proper research. But certainly not Arvato.
Hoarding photos on your phone?
Those picture are hogging memory and could be slowing down your phone.