Sorry.
There are hundreds of better three letter .Mobis available.
I am not sure I would advise investing in any of them (and I own many three letter Mobis) without getting a good understanding of the unusual situation of .Mobi names at the moment. I recommend many hours of study - enough to get your own opinion of a complicated, controversial extension.
Also, WMV is Windows Media Viewer, probably a trademark. Microsoft can take it away whenever they want.
If it has been 4 days or less call the registrar and see if you can get most of your money back.
Everybody who discovers domains spends before they learn. We all do it, it is part of learning a fascinating business, but a lot of people spend themselves out before they learn what to buy and what to pay for it.