Colonial Grand at River Oaks

I moved out my apartment last year Dec. and I noticed office manager about the carpet damaged because she did not do the walk through with me (she said becuase I turn so late, so she asked me to come back on the second day and guess what I went there on the second day, and she was on the meeting and no time to do it). The office lady told me later manager will send me the bill for damaged and I did expline why the carpet got damaged. After one month I called the office and the lady told me it normalli takes about a month to get everything done and no news is a good news. I should receive it anytime soon if there is a bill.
Guess what !! I received the collection agent notice today without even receive the bill from them. OMG. I never said I am refused to pay, and I even noticed the manager about the damaged when I moved out. They have my new address becuase the collection agent have one (collection agent office forward it). The carpet damaged is due to upper floor’s water heater busted and all water dropping down messed up everything even my matress. They did not even repay any of my damaged items and still charged me for carpet.
I do not mind to pay the damaged carpet because I want to get out of this apartment so bad due to cockroach. They charged for pets control and never kill them. sees it all the time. even in the dishwasher.
I can show you all «urgent» notice that I sent to office about the cockroach.
What is so wrong is they did not even bill me first and send my info to collection agent.
Who knows what exactly the bill is. For all renters, watch out before you rent.
Any lawyers. is this legal? send my bill to collection agent without any notice.