IDEA postpaid connection
Misuse of old sim

I was having three idea prepaid connection which I converted into postpaid as I was told that there was very good scheme on it. But I received a bill with huge amount and stopped the payment and enquired about the same from whom I got the sim and decided not to pay till I get the correct information. While giving me the connection my old sim was taken away by the provider in which there was all contact numbers which I did not removed. Now the telecallers are directly calling any of the number from my old sim without even knowing that who are they and briefing them that I have not paid the bill and if they know me they should tell me to pay the bill. Is that correct? They should contact me directly or issue a notice to me instead of misusing my sim. This is totally wrong and action should be taken against the telecaller for the same