Marketing calls bordering on harassment.

In the last two days, I have received 16 unsolicited phone calls from Cartrack. I challenge you to show me where I signed or ticked a block giving consent for you to contact me. If for some reason (as in the case with so many companies) that you obtained my number from an affiliate or another company, I challenge you to show me where I consented to be harassed by your stupid ineffective marketing calls. Out of principle I would not ever use your company....ever, purely due to these calls.