Huurkor sunnyside

I am very upset with this shame of a company. They blacklist me with out even sending me notification.i moved out of their apartment September 2018 where i did tell them i wont be coming back they requested a letter from my doctor proving i am on maternity leave as i wanted someone to continue whilst i am away .they declined that person in which in return i tols them i can not continue staying there and they received their keys .Today i find out they blacklisted me when i speak to a Chrstelle She tells me they sent letters i received no such .they have my email adress,they have my contact number there is no trace of them sending me anything .How do you blacklist a person without notice? You took my deposit including keys and remotes i had to pay for but still blacklist me .I Demand this blacklisting removed because I am going to take this really far.Huurkor sunnyside is ****...