Regret signing a deal with them

Horrible service, they still billing me after moving out 3years ago. Send them that am not renewing my lease and didn’t even get my deposit back.now the bills sit on 4500k, even when I moved out I paid the last water and electricity I used. but now I have being threatened with a lot of sms and emails. I work hard for my money am not gonna get ****med for my hard earned money. I even involved the lady who help me with my lease to send them an email. Even when I was using them, I will pay 2500 a month living alone. Most of the time I was not home, make it make sense.