Found this via google after having problems with Sporting Index myself so I'm not surprised someone else has had problems also.
I have had the same experience with sporting Index, claiming i owe money that i don't even owe, i find the attitude i have so far had of them disgusting, i filed a complaint with the financial ombudsmans as this company think its above the law, i will also be seeking compensation for damages due to the stress and damage they have inflicted on my credit file.
They cant even prove that i ever even applied for credit! Why, because i never did!
Yet they claim i owe money to them!
I would warn anyone against dealing with this company.