Wrong number harassment

I keep on receiving calls (robo calls, calls that drop as soon as I answer, and calls from actual people) with regards to an outstanding account. I have explained numerous times that I am not the person they are looking for and that they are calling the wrong number, the person who created the account probably gave a random number (which is mine) because I have no connection to the person or company I am phoned about. I have listened and explained on multiple occasions that I am not the "Mr America" they are looking for, neither have I ever had a Truworths account, but the harassment continues.