Trai — exchange of airtel sim card of my number [protected]

I am the customer of your telecom service and done the recharge of amount of rs 35. My problem is my sim card was broken inside. Then i am call customer care number to resolve the issue and suggest to go nearest airtel store with our original id proof. Then i am going to nearest airtel store which stablish in geeta colony and where tell your sim card is block and please recharge of rs 35 to unblock your sim cards then i do i goes to sikh candidate in the srore to sim replacement and he was forced to postpaid sim but i request please sir provide my prepaid sim card then he is tell sir your sim card was block and your outgoing incoming calls are blocked and the sikh candidate said sir because due to your blockege of incoming and outgoing i am not sufficent to provide prepaid sim card i am only provide these number in to postpaid. But i said sir please try it the sikh candidate said sir you came tomorrow and i am gone continuously visit in the airtel store for three days but only on solution he was present sir take your number into postpaid otherwise i don’t provide your number into prepaid. In simple word he is enforcing to sold postpaid number. My question is TRAI who one provide the right of telecome companies does not issue a prepaid number. Who one provide the rights to force to take postpaid sim card. Sir i am facing big problem please resolve these issue. I am also complaint in airtel but no satisfied reply does not provide .please resolve these issue as soon as possible.