Worse service ever

We got a new double deal cellphone contract from Vodacom shop, Carnival Mall, 6th April 2023. The two new numbers we got seem to be belonging to someone. When calling them they are engaged and or goes into someones personalised voicemail. Tried calling the helpdesk and got no assistance. When searching for these numbers, they bring up someone and callerid cant edit that. Vodacom helpline mentioned to get another number at my cost, we were charged for these sim cards remember.