I recharged my mobile phone having no. 8689 airtel, first I recharged 200 rupees successfully, after that I recharged 300 rupees to the same no. But there was an error message displayed, I again recharge 300 rupees, then my mobile recharged with 300 rupees. But my account deducted by 600 rupees, and I got only 300 in my mobile. Solve this and help me plz.