Airtel — payment deducted from hdfc but recharge not done

Hi,

My number is [protected]. Airtel citrus has deducted an amount of rs 199 from my hdfc account. The transaction happened on 25/04/2018. But airtel is saying transaction failed.
If this continues then i will change my sim to some other company. Please look into the issue. Kindly refund the amount to me as soon as possible.

Going by the other complaints it looks like, it is normal for you guys to do such a thing, ie deduct people's money and not recharge them the valid amount. Is this some sort of scam?

Yours sincerely,
An unhappy customer.