If you knew that you only paid 20 bucks for those tiles instead of been 200 bucks, I am not even sure why you would consider dodging it,
Be a man and pay up
because I don't approve of others trying to pass the buck, and accuse me of anything untoward, when they could of just admitted to the stuff up, ask for the difference back, and apologize for the inconvenience to me and that would be that.
Instead I get a rep who has clearly got his **** kicked for the stuff up takes it out on the customer, and gets abusive when I said I need to check my bank account to confirm what I was charged.