..... If so, any suggestion that I can get BTC ?
Not that is my job to be involved in this one, but lately I am researching Lending section for my own reasons. Try to read this better:
You are dealing with real money here, child.
Let's assume that you are honest on this one (that your mom is coming, that you need money etc.), but you can't just ask for a loan from others so you can
gamble on a ponzi scheme.
P.S. And come on, do you think that 0.5 BTC will be enough for you and your mom? Not that I underestimate the value of $113 (atm), but Europe is not Uganda (though there are several relatively poor countries (my own included)).
The best advice I can give you is to say you're sorry, be transparent and after some time you can kindly ask Vod to remove your negative trust. That is if you really take your account seriously.
Cheers,
Spartak