Threatening SMS's / Phone Calls

I lost my job during 2013 and experienced extreme financial difficulties, lost my husband and were not able to meet my financial obligations anymore. Before this happened I had a clear credit record. (My ID *** 084). I had a Woolworths account which I paid to them directly whenever I could, phoned them to make arrangements no problem. Then out of the blue I received a call from Books & Luyt attorneys to make payment arrangement which I said I will do as per usual direct to Woolworths at R250 per month. Since I made the arrangements I can recall twice that I paid R100 instead of the normal R250, then I explained my situation when I get a phone call from these people. More than once I requested a statement - NOTHING. I now check my balance direct from Woolworths. PATHETIC SERVICE from Brooks & Luyt \professional"consultants a disgrace how they talk to people!!! This morning (23.06) I got this SMS --- \""WE HAVE TRACED YOU AND WILL BE SERVING YOU WITH A SUMMONS AT YOUR MOST RECENT ADDRESS RE: WFS. PAY R150 IMMEDIATELY\""....is this correct according to legislation to threaten people. I tried to phone and put the phone down after 20 minutes!!!"""