Absa does not listen to its customers

I have been getting more than 10 calls a day from absa agents wanting to speak to someone I no longer work with. I have told them millions of times that its the wrong number and they will call me back 30mins later. Can I not be harassed for something I dont know and a debt thats not mine. I am not even that much of a support of Absa because they failed to pay out my mom's funeral cover apon her death so the last thing I need is to get calls from a company that has poor service and empathy. Get my numbers out of your system