Product: Debt collection

gents, First, I rented the apartment number XXXX in XXXX XXXX XXXX in XX/XX/2016 and from the first day, I saw some roaches in the kitchen but after that I  found a lot of roaches in the kitchen and bathroom. 
I told the manager about this problem and she told me that there is a company comes every month for treatment. This company came five times but nothing changed and the roaches are increased more and more. We found them in the clothes ; furniture and my wife saw them many times in our food and I have kids and this is unhealthy for us.

I have a baby and when he started crawling my wife saw him hold a roach in his hand, she went to the manager and asked her to end the lease or move to another apartment but she refused and tell her you have to complete your lease.

The next time the baby put it in his mouth and my wife found him eating something and when she remove it from his mouth she found a roach, she told me and I asked the manager again to move out but she refused. we have a friend in the complex she told us that there is a person lived in this apartment before us for two months but he moved to another one because of roaches and when I went to the manger again she told me if you have someone can sit in your apartment and pay the rent under your lease it is okay for me and I am new here and dont know thats illegal. I trust on her and made a post and there are a lot of people came but when they open the cabinet in the kitchen and saw the roaches they refused to take the apartment until someone came she called ( XXXX ) and she agreed to sit in the apartment and I moved to another complex. 
In the next day she sent a message that the roaches are horrible and cant stay in the apartment.I sent email to the manager and asked her to move to another apartment and she agreed but after that she told me that they will make a termination and end the contract in the end of XXXX. 
After that I received a letter from the court regarding this problem and the complex want me to pay the rent until the end of XXXX and when I explained the problem to them in the court they gave me dismiss for this case. 
After the dismiss I went to the manger to request my deposit she told me we will send it to your new address. I surprised when I received the bills ( {$7100.00} ) 3 months for rent ( {$1500.00} per month ) + legal fees ( {$1700.00} ) + painting, cleaning and carpet ( {$910.00} ) from the collection company ( co-operative Adjustment Bureau , Inc ) and I contacted with them and explain with them my case but they didnt care about it. 
Finally, I want to say that this was the first year for me in USA and I didnt know that I made a mistake when I let someone sit under my name and I dont know that I have to call the health department and can make a complain against this complex I paid every month in the first day of it because I want to keep my credit score high and didnt effect by anything because of my children and their future when we want to move because of their school or if they want anything I dont find any problem because of bad score. And you can ask them about that and also you can ask the manager of XXXX XXXX XXXX where I lived there for one year about my history for paying the rent his name is XXXX ( XXXX ). 
You will find attached copies for all documents that support my case. 
Thank you so much. 
XXXX XXXX