RL Daly Attorneys review: unknown account

I am constantly getting SMS's and calls from the RL Daly call centre regarding an unknown Edgars account for an amount of R 3 900. I had an Edgars account which was closed and the card cut and return to Edgars in 2014. I have an email from Edgars confirming this.
The SMS received states the ff :
Your overdue EDGARS acc has been handed over to RL Daly Attorneys. Call us on [protected] to Settle your balance OR to set up a debit order. Ref: 9445278.

The last call I received was this morning (15th Aug 2018). I explained to the caller,
(thank God this one understood english) once again of the REAL situation and informed her that they need to proceed to court and i will address the issue there and counter sue them for harassment. She stated she will make a comment on the system and i will not get any further calls or SMS's. 15 min later i received the above SMS.

This is abusive...RL Daly is situated at 24 Flanders Dr, Mount Edgecombe, Durban, South Africa, 4300 and their e-mail address is [protected]@dalycall.co.za

SURELY SOMETHING CAN BE DONE. THIS IS ABUSIVE