Protection Plan

I'm utterly disappointed by the service i'm getting from direct axis. I have requested that they should cancel protection plan on my account since i have an existing insurance cover with another service provider, and i was then told to send form 23 to them. I sent this form in March 2014, again in December 2014 and twice this month February 2015 and i still haven't received any feedback, and i'm still being charged for protection plan on monthly basis. I have been trying to contact the call center to make a follow-up but the call just goes unanswered. I just want to find out when am i going to get a feedback and when am i going to get a refund for the protection plan fee that was debited on my account since last year, because currently i'm paying two insurances for one product??