Didnt close my account and now they Claim i am owing

I settle my account and now my account is not closed. they send me a letter to say my account is in arrears and I ask how can a closed account be in arrears? Game is disgusting and I wish if everyone who have an account at game could realize how they operate. they don't care about customers that pays their bills You ask for something to be changed and they don't and they come back telling you that you owing. They are very disgusting, poor service and *********** staff that forgets their duties.