Poor service and deduct 20%of your deposit

Poor service charged me 20% of my deposit after they realize they can't make a banner. But 1stly they said they can make it for when I've paid my deposit there after they came up with a story this and that is not correct. So then they said they'll create a new banner at R450 extra so I said it's too much for a banner they can ell everything and paid back my money. So they went ahead and created a banner the doesn't even represent my products now they charge me 20%for this useless banner. If I ask my money back they just don't answer me at all. Please guys watch out for this place.This is not how you run a business they said they vmcan make a banner and after you've paid they come up with stories and then take 20%of your deposit money.