Item sold due to carelessness

Good Day I wrote about cash Crusader selling my cellphone the other day during the extension period, my problem has still not been resolved and they don't really care to resolve the matter if I don't adhere and submit to their terms. I am the customer and I believe I should be satisfied with terms and conditions and agreement. They have shown no remorse at all or any care with regard to this matter neither made any effort to resolve the matter. Kindly please assist me as where I can report them and take this matter further