Ghost of Associates

I had a Debt or have a Debt with Markham apparently they sold my debt to a firm of lawyers called Pienaar Sithole and Associates, I thought I had settled my Account last year but I saw a balance on the credit reports this year I tried to reach out to this company but allas, tried to call them all the numbers that was given to me and on the internet don't work and their website numbers I emailed them but still I haven't heard from them yet, apparently Markham is finding difficult to reach out to them too thats what they consultant said to me, I don't know why Markham would sell their customers accounts to a ghost lawyers I call them ghost coz that's what they are doing to me they are ghost me , I really don't know how I would get in touch with this company really really

Please Pienaar Sithole Associates if you can reach to me A.Mrobo