I am so sorry that you are having to deal with this situation. Do you have documentation of the agreement you made with the property manager regarding the $150 payments? What about documentation showing that you were able to get the eviction dismissed? If you take all documentation along with all emails to the apartment complex you are interested in renting from, I don't see why they would not overlook this blemish on your credit.
In the meantime, don't give up fighting this, especially if you know you are in the right. It might take some time but you should be able to repair your credit again. In the very least, it seems to me like you have a legal standing were you to challenge them in a court of law, however I am not a lawyer and cannot give any legal advice. Just an observation.
I wish you all the best!