Unending telemarketing

The unsolicited telemarketing from 1life for months now is extremely frustrating. The caller/ automatic voice prompt (I honestly can't tell, the voice sounds like a human but is so monotone it could be a robot) won't respond to any questions regarding getting off their call list or how they got my number, etc., a behaviour which draws suspicion as to how they got it in the first place.

Not named as I don't doubt the caller (if a person) is following protocol and can only assume 1life has an aggressive policy that forces such rude and intrusive marketing. It makes me not want to ever consider 1life's products quite frankly.