Standard Bank harrassesment

A employee left our employ 8 years ago, but periodically we keep on being harassed with calls. No matter how many times we say we are a company and he left our employ the calls keep on coming - they never note it on the file not to call this number anymore. Now for the last 4 days in a row we keep on receiving robot calls (each day from a different number), asking to contact Standard Bank Home Loans to arrange payment. I have called them three days in a row now requesting them to remove our number as we receive ± 10 x calls per day and it is causing missed calls on multiple extensions and wasted time and is incredibly frustrating. They claim they have romoved it, but the robot calls continue to hound us.