You can submit a written representation under acknowledgment to Nodal Officer of company by email, fax, letter and mention the facts that you had submitted the following documents:
-SEF number
-Your photo ID with number e.g. DL, PAN card, Voter card number.
-Photo
-Address proof with number e.g. Voter card number.
and you should have been issued the SIM card in your name. Whereas you have come to know that SIM card has been issued in some other name. You can mention that this is a serious offense and you can land up with serious security issues due to illegal conduct of the company. You can ask the company to supply you the duly certified copies of all docs submitted by you as mentioned above along with their reply.
Kindly mention that you do not want any reply by phone call, SMS, and no one should visit you without prior appointment or without company ID and written reply to you should be supplied by regd/speed post only with in next 7 days or you shall be constrained to report to SSP of your area. You can mention that you shall be responsible or accountable for any activity related to your SIM card issued to any other individual and the SIM card issued to you shall not be deactivated till your SIM card is supplied to you.