Handing over of a **********ly opened account

In 2016 I received a call from Standard Bank ***** department alerting me of an impersonator who opened accounts **********ly using my identity.I was adviced to get some documents form Home Affairs confirming my identity & submit them to the nearest branch,which I duly did.Later that year I received an email confirming closure of both accounts & debt written off.

In 2018 I started getting harrassing calls from Debt collectors regarding the same accounts.My efforts to get help from Standard Bank hit a brick wall.All I'm asking for is for Standard Bank to send me a account closure confirmation letter & stop this debt collectors from harrassing me for a debt I never incurred.