Failure to receive my items after payment

Sector / Department: 

I deposited money in installments to an iron sheets company re seller between September 2014 - December 2014 amounting to UGX 4,780,000. When i went to pickup my iron sheets after, i was told that only one of the receipts was valid.
I have tried to recover my money but in vain. I didn't get what i paid for and haven't got refunded. They only information i got was my account holder left the company.