Unwanted service started by airtel

My no. Is +919463612562. I i have seen a text msg timing 5.53 dated 25.08.2017 that thabks for choosing a service modelmaniaw and you have charged rs. 35 weekly and it will be auto renewed.
why this unwanted service has been started ? And unwantedly charging 35 per week.?
You are requested to immidiately remove this service and pay back the amount charged for this. Thanks