atg stores Charge your credit card full amount when you have a merchandise credit from them Internet

eI had a merchandise credit that I wanted to use towards my new purchase of lights. I found a lower price at two different online and physical stores. They say they will price match it but they really don't want to. They tried to tell me that the free shipping that the other sites were offering was only until the end of the month. It was early in the month when I was placing my order with them. They wanted to charge me for shipping even though they offer free shipping themselves. Then they finally agreed to price match but told me I couldn't use my credit. I threatened to go to my charge card company to get a credit applied to my charge and then they called back and said they made a mistake I could get the price match and use my credit. Unfortunately they still billed my credit card for the full amount of my purchase and didn't apply the merchandise credit. I sent ATG several emails and called them but they never corrected the matter. I ended up  disputed the charge with my charge card company and received the credit back from them. ATG has the worst customer service of any company I have ever done business with. They always have to check with someone before they can process an order or answer a question. Then they don't even do what they say they are going to do. Will never do business with them again!  Good bye ATG stores and your terrible customer service. I will shop elsewhere