Airtel — Balance deduction of rupees 20 for no reason

Address: Singrauli, Madhya Pradesh, 486889

Balance of rupees 20 has been deducted from my airtel mobile account [protected]. Although there was enough balance and data balance of more than 1 gb then also 20 rupees has been deducted... kindly do check for this inconvenience caused and refund my 20 rupees as soon as possible