Airtel — infinite auto messaging to 542424

Address:

Bangalore, Karnataka

My airtel number is 0990#2550 and mail id is [protected]@yahoo.co.in, my problem since three days post changing my handset, from my number automatic sms sent on to this number 542424& i show only delivery report & balance deduction in my mobile display cutting 3 rupees. This all happening without my knowledge. I am complaining to airtel. Kindly help me to solve the above problem..