Getting calls from a previous employer customers

Can Pizza Hut head office in Johannesburg assist me. I was employed by MLP Pizza Hut and have since since left the organization. I am receiving calls every single day for the last 5 months from customers saying they want to place an order. I have complained to the management of the MLP Pizza Hut to remove my cell phone number from their website, but nothing has been done. This is causing me discomfort and is upsetting to continue being bothered by people when you have nothing to do with the organization. Pizza Hut head office in Johannesburg, please can you help me!!! This is very upsetting!