Postalstuff.com Postal stuff Will not issue the rest of my refund from an order in April Columbus Ohio

I am a regular customer of this online apparrel store. I ordedred a large order from them but did not hear from them in a long unusual amount of time. I called franticallyfor days an I finally got some one to answer the phone and I explained to them that the order was for one or more persons at my office 3 months later he sends their portion which amounted to 6 T shirts. The total order wasalmost $300.00.I was curious as to what the hold up on the order was and it seems that 1 of the items was discontinued.  I asked for a partial refund but, the agent informed me that he had new alternatives and that he would send me options of other choices of another brand of new clothing lines but that never materialized. Later I just asked for a refund. He has repeatedly told me he was calling me back , but, now my phone calls go straight to voicemail.