Voicemail keeps calling my phone after a voice message has been left

Dear Vodacom,

Please shut off the function that Voicemail calls my phone if there is a voice message, this is an issue if I reject a call and then have to constantly reject voicemail calls constantly coming to my phone. I neither enabled this feature nor requested it and with all due respect, this is a stupid feature and I want it removed as its disruptive to my work.