Reliance General Insurance — they are calling for reminders of renewal of my insurance multiple times

Address:

Pune, Maharashtra, 411045

I have sell my bike on may month and on december its insurance is completed i hace tell the customer care that i have sell the bike and now i dont want to reneval of insurance. But through yet i have received around 58 call from there customer service to remind me of reneval of insurance. I have explained them in all possible ways in 3 language that i dont want their service's now. But they dont getting it and calling me after and after. Can any one tell me how the hell i stop these people from calling me.