Duracell harassment! (Lasts six times longer than any other bunch)

A while back they contacted me on my private number. Told me about what they had to offer. I declined, since I already have my insurance in place. From there every few days they try again, thinking/hoping my position changed. With their relentless attitude they will be the LAST company I ever consider for insurance. If I say no once, please accept it and move along. The manager I spoke to, assured me that I will no longer be bothered. Please take your call center agents and give them **** UK / US numbers to bother.