Dishonest seller on bidorbuy. I want my REFUND!

Had an issue with a very dishonest seller. his advert was very deceptive. After purchasing an item, the seller contacted me and asked me for more money. I got very angry and decided to ask for a refund. Now the seller and bidorbuy r playing ping-pong with me and r not refunding me my money. right now both of them are *******!!!!!!!!!!!!!!!!!!!!! ABSOLUTE *******!! AND THEY WILL REMAIN ******* UNTIL I GET MY REFUND!!!!!! MY COMPLAINT NO. IS: #GHS-***1