Airtel — airtel gave my number to someone else

Address:	560043
Website:	Airtel.in

I have been using my number for about 14 years now and came to us was still recharging my number. Without sending me an email or any notification airtel assigned my number to someone else. I am at a high security risk as this number is connected to my bank accounts etc. Airtel - please check this immediately and help me in getting my number back. I have screenshots of my previous recharge and it’s not 90 days yet