If you search the forum there are a tone of threads which detail getting your BB unlocked but here is the long and short to your question. With regards to clearing your device just install the desktop manager and under back restore there's an advanced feature which will alow from quick deletion or install the javaloader.exe and wipe the device completely.
As for unlocking sorry but Bongo Wireless is pretty much your only option www.bongowireless.com
(no there is no other option, at least as fool proof and working as Bongo ie Voice/Data/PIN) Not sure what you paid for your device but BB unlocking doesn't come cheap. It may be in your best interest to sell the device and purchase one for your network.