My Coin Auction never use this app

This is a waste of time app i have purchased R1900 two weeks ago tried selling 5days later then it came saying theirs more then 10 million coins in auction i cannot sell i have tried to sell after every auction for the past 2 weeks twice a day. The **** thickens they said i must invest 20% more than will be able to sell i purchased another R500 but that also didn't help cause when i try to sell anything there is always 10 million coins on auction