Fail to give back what is due

They called me nonstop to make payments for a service not rendered to me. When I finally got through to the third party of which Edgars failed to assist me with, I got a reference for them to give me a refund. It has been over 2 weeks and Edgars is now ignoring all my messages but when they wanted my money they could call me almost every 2 weeks. Now that it’s my turn, they’ve gone mute.