Platinum TV Box Haven't received a refund Beverly Hills California

I purchased 3 boxes and a mini keyboard from Platinum TV Box. it took several weeks to receive the merchandise. When I received the box , I gave one to my son to use on his tv, his tried for about a week or two to get it to work and couldn't get it to play. He gave it back to me and I just put it back in the box it was shipped to me in. I went to post office and returned the box with everything in the box the way it was shippeed to me. I mailed it back to the address on the box and pay for the return myself. I mailed the box back on Jan. 16, 2018. The box was delieverd to the address on jan. 18,2018 at 11:47am to the front desk/receptionist. I have tried for three weeks to contact Platinum TV Box to find out when I would receive my refund on by card. The number I call answers stating  thank you for calling and gives there office hours and then gives you the web site to go to . neither location gets you anywhere. You cann't speak to anyone nor get to anyone on the site. You just keep going around and around getting nowhere. I just want to talk to someone to find out about my refund or if they're not going to give it back to me then mail the murchandise back to me given if it doen't work.