Maria Duval/Destiny Research Center After returning 6 packages requesting refund, they failed to respond after many attempts. Sparks Nevada

Purchased 6 packages from them. Returned all 6 from SEPT.2014 TO FEB.2015, following all their policies for refunds but I have not heard anything. 9/11/2014 - Maria Duval, $10.00, check 4958. 10/8/2014 - Maria Duval, $45.00, check 4979. 10/22/2014 - Destiny Research Center, $45.00, check 4990. 10/23/2014 - DRC, $45.00, check 4991. 10/29/2014 - Maria Duval, $45.00 check, 4996. 11/4/2014 - DRC, $45.00, check 4999. Total refund due me is $235.00. Plus I spent money on return postage and I have receipts.

Desired Resolution:
I need the 6 refunds in amount of $235.00 Postage expense of $11.07: $1.61 $1.82 $1.00 $2.03 $1.61 $2.00 $1.00 In addition to the $235, I would like if possible to recover all postal expense of $11.07.