Submit a written representation to the nodal officer and mention that on dated................the representative of the company Mr/Ms...........at company phone number......................during your or company's call at your phone number..................stated that unsolicited service of...............was started by company without the consent of customer and agreed to refund the charged amounts within next 24 hours..but has not.
Demand the recorded conversation from nodal officer and text of conversation in writing and notes recorded by the representative in the notepad/computer and official address of the representative, in next 7 days.
In all probabilities nodal officer shall not supply and then you may escalate to appellate authority.
Simultaneously you may visit the office of the company with your witnesses and play the recorded conversation and record (audio/visual) your representation to the company and prepare the minutes of your discussion then and there and impress upon the BM/RM to receive and acknowledge the receipt.
You may approach eminent local newspaper and forward your complaint to print and electronic media e.g
https://www.mouthshut.com/
complaint@network18online.com
pehredar@moneycontrol.com
pehredar@network18online.com
https://www.facebook.com/Pehredar
www.bighelpers.org
Tame and shame them. If you are in a corporate and have friends in corporate you can join hands and from a community of neighborhood etc. build pressure on local BM that your community shall advice each and everyone to use mobile number portability and ban this company.
You can also mention to the nodal officer/appellate authority that you are contemplating to apply the choice of MNP.
You can log on the company web site and avail the email id/ addresses of top management and mention that you shall fight for your rights and shall be constrained to go public at the cost and consequences of the company.
You can lodge a complaint to TRAI/DOT and later use RTI to find status of your complaint and resolution.