There are QB in my QQ account. Why does it buy any business in Tencent and the virtual items in the game, the balance of the purchase failure account is insufficient

You are sure if your account really has QB,
Remember that there was a modifier before, which can modify the local account information, but that is fake, showing QB, but it can't be spent.
In illegal elements use this method to deceive profits. It is cheaper to sell to someone less QB. It is really virtual, but there is no information in Tencent's server. Essence Essence Essence Essence

It you can check if you are deceived and see how you rush QB.

If you use some cards, you can contact Tencent customer service, or use your other QQ number to transfer QB and then bind the business to this number.