Cash Crusaders don't want to assist me with the lost pawned laptop.

I have an issue with the store , after I wasn't called to receive payment for my pawned laptop that was looted. When I go back to the store owner Jeff is making it my issue saying that I changed my number. When I am still using the same number and email address which we used when communicating before the payment where. I never changed any if my communication site. I really need help with this if anyone know where can I file a complaint and get assistance. I had just bought my laptop from hifi corp for about R6000 and i received R1700 for pawning it. It was just 3 months old. This really is frustrating. Before the payment where I communicated with Mr Mark Wiese and Chantall Van Tonder. And I went to the store couple time. Travel by taxi and I was employed at the moment. This had cost me a lot of money until they told me to wait for a call but now I am at fault for not being called.