Airtel — rajajinagar store staff given wrong information and rudely behave with me.

My post paid contact is [protected]. I am using this number from last one year. But unsatishfiedly i want change my sim postpaid to prepaid. Rajajinagar and basaveswar store staff always giving the wrong information. We are asking any thing they giving always wrong information and rudely behave i am not continue this plan i want quickly change postpaid to free paid pls suggest quickly.