Airtel — cashback not received, airtel thanks.

I received a call from an unknown number with knowledge about the airtel payment issue. (screen shot o[censored]nknown number is attached - for reference). But the person solving the problem asked me to install a app which would give him remote access to my screen... as part of the solution. It was ok fm my side as long as non-intrusive and sticking to the airtel issue of non payment of cashback. The character asked me to credit 10/- into my airtel account through credit /debit card. But luckily the card data was pre-installed /saved in airtel app! These team who had the remote screen suddenly asked me to make payment credit into my airtel payment account feeding in new debit card number - ( fraud sign), which was strange. So I asked the intention (meanwhile they kept asking for otp 's which I was receiving through sms for adding 100/- (as there was no 10/- option in airtel app)) they did not know the exact issue. I decided to cut off the fraud call. But I feel there's a leakage in your system whereby mu number etc detail went to the fraudsters, within few hours!!! Also in the past 300 + times during past 7 years, all reversals of money to my payment source have been automatic, without me having to give my credit card, debit card, bnk account details to any customer care chaps. Please warn others also about such fraudsters.