Internet solutions Durban, Umhlanga constantly harassing people

Being inundated with spam calls from this company Internet Solutions in Umhlanga, Durban , which I have never and will never have dealings with. I wish to revoke them access to my account or will take up with relevant authorities in violation of POPIA . Someone should look into how they are getting our numbers I think it may be under the books. Upper management should be ashamed to work for this company.