Nimble call centre harassment

Can you please assist. About 7 years ago my wife had an Edgars account that we paid up an closed the account. Recently we keep on receiving calls from there call centre that we owe Edcon R108. For the 20 th time we ask for the proof of what we per chased and they can’t provide any thing. When we phone them on *** they answer the phone and can’t help you any further. Can you please assist and help stopping this harassment from there call centre. ***