Airtel — about port

My name is dhananjoy paul, i applied for mnp of my mobile number [protected] from aircel to airtel, but airtel company issued my number to other person, when i call airtel company they don't resolve my problem. I want this number because i gave that number to my bank and it's very important. Please resolve my problem immediately. My current number is [protected]. This is how airtel company treat their customer.