Number being flagged to avoid ***** cause I’ve been calling call centre with not help

Been on the call with Vodacom since morning trying to put a notice for my contract cause it’s ending. Was told to call after 2pm due to the system will update everything that was updated. When I call I’m being told my number has be flagged nd blocked to avoid *****. I don’t know what to do now cause even the watsapp number I’m being told to watsapp it not working. When u join it’s not a hassle but come to cancelling its a mission. I’m so disappointed with Vodacom after 20 years with you guys.