IPhone 5c randomly taking my credit?

I just topped up £10 and when i went to double check my credit i only had £9.31 anyone know why it is randomly taking my credit?

Added (1). How am i using my phone too much when i bought it 3 days ago and i only use it for texting and listening to music. The problem is that it takes credit when i don't text or do anything on it

Your using your phone to much

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