Fishy CSS credit solutions

For some odd reason, Cell C decided to hand over my so called debt to this company, having not succeeded initially with Blake and Associates and SSDA.The later company did find reason enough in the evidence I did relay to them that brilliant minds at Cell C are clutching at thin air...low and behold some CSS consultants are harassing me constantly....calling me at abnormal times, leaving messages at my work place when I have with me my cellphone 24/7...never even tellling me their full names upon request..Cell C informed them that i owe IT upwards of R4000...meanwhile the same Cell C have altered their alleged debt to R145 on my credit profile...and surprisingly CSS consultants are of the view that the problem is with me..CSS please join forces with Cell C and serve some summons or something because you harrassing me will not get us anywhere...thank you for understanding in advance..if you can manage...