Second hand bike gear

We took some of out bike gear that is not being used anymore for them to sell... What a mission the gear was left with them, they sold a few things didn't notice us that it has been sold when I asked they sold R4000 worth of gear took me several messages and phone calls just for Kevin to pay the money, eventually he paid only R3000. Later on I messaged again to see if the rest has been sold they closed down the shop without informing us, sold our gear and didn't let us know, I went to the shop to speak to Kevin, we came to an agreement that he would pay the rest of the money within a week it has been 3 weeks now, I phoned he said he would make the payment on Friday which didn't happen, I called and no answer.

What a way to treat your clients