There is an organised racket in issuing the sim cards. Sometimes it happens due to the technical problems that the sim card registration is shown as failed. In such cases, if you shut down the telephone and restart it, the problem goes. However, in your case, what I believe you have been cheated by unfair trade practice by the service provider. In the cases where the mobile phone cards are issued by an agent against prepaid connections, he in fact, uses your identity for issuing several prepaid sim cards to different persons who do not have their own identity card or misuse the telephone for the purpose of committing crime. This is rampant everywhere and this is known as identity theft. This is also a punishable offence as the person whom you have given your photographs and other details before getting the connection misuses the same by committing criminal breach of trust. You are requested to get the matter enquired by filing a complaint with the service provider for his unfair trade practice because in such case when your Sim card had been destroyed or became defective, you should have been given the same number by the person from whom you purchased the second one. This offence also falls within the ambit of Consumer Protection Act 1985 and if you file a case with the local police station or a complaint with the consumer forum of your place against the service provider as well as the agent through whom you had purchased the telephone, you will surely get Justice along with the compensation. Moreover, a complaint at the local police station is a must from your end to save yourself from legal complications in future.