Ditto TV — automatic subscription

I have no idea how the ditto lite tv subscription for activated on my phone number [protected]. I got to know about it a while back while speaking to idea customer care and have deactivated the same. It was then that i checked the smses on my phone and saw the activation messages from ditto lite tv since 2017, charging me 35/- per week through my service provider! I had never paid attention to these messages earlier! I would like to know on which date the subscription was activated and the means how it was done, because i personally did not do it.