Airtel — airtel sim is rejected

Just to know the various options available in the cell, I unfortunately locked the pin. It asked PUK No. I typed some No. It again asked to verify the pin but to m y dismay it says it is not tallied. Three to four times it went like that. Finally a notice is appearing "sim card rejected". I seek your help in restoring the same as the number is well known in my relative/friends circle. I am missing a lot and I could not replace it with a new number. Please help me.