Direct TV would not give discount on bundled services as agreed/Then turned account over to collections

I opened an account with Direct Tv and they did not offer the internet in my area through att so was directed to windstream. I called Windstream and got services bundled. ( so I thought.) when I received my bill discount was not on my bill. I was told it may take a month or two. I called every month , even had windstream call while on three way. Every month was assured that it will spot next month. This went on for at least 6 months. Not to mention these calls last 2 hours or more. The last call I WAS TOLD OH ITS TOO LATE WE NO LONGER OFFER THAT PROMOTION. So I asked them to cancel my account. Now they Have turned my account over for collection. I’m trying to buy a house and all of a sudden this shows up. How unfair is this? So a company has the right to have one sign a contract agreeing to the contract then change the terms within said contract and I required to pay a fee when I cancel. I tried to handle this with customer service the retention dept and got blowed off. I will pay the 213 just to make this go away at this point. I will be filing a complaint with FTC, the BBB and will be seeking the services of an attorney if I cannot get this taken care of in the next day or two. I wonder how much an jury award I may recieve if I get turned down because of this collection. I will be asking for the cost of my house at minimum. I’m sure att and direct tv has heard this before only to have the customer not pursue it but I promise I will.