Product: Debt collection

This entire interaction happened within the last 2 months. I received the bill that I asked for on XX/XX/XXXX from BAC Services dba Bureau of Accounts Control, XXXX XXXX XXXX XXXX, NJ XXXX. Phone : XXXX I have received a written notice in the mail from BAC Services, LLC ( Bureau of Accounts Control ) that stated that I owe {$160.00} for XXXX work performed in XXXX of XXXX. I called the number in the letter and spoke with ( possibly XXXX ) not certain, but all my proceeding conversations were with her. I explained that I was in Chapter XXXX bankruptcy since XXXX of XXXX and that I am on a 4 year plan. I told them that I have never received any bill from my XXXX and that this is the first time I am made aware of this. I asked the person to please mail me the actual bill. I also stated that I would not have refused to pay a bill in the amount of {$160.00} while in Chapter XXXX. I was working really hard to have a clean slate after the discharge of my debt. She became annoyed with me after I told her about my bankruptcy but agreed to send me the original bill. 
After I received the bill I noticed that out of the {$160.00} charge {$110.00} was for billing and not the actual charge. I received another call even though I told them to please not call me and that I will try to resolve this as soon as possible. I also informed them of my lawyer 's name and contact information which the lady I was speaking to did not care to take or acknowledge. 
I live pay check to pay check. I have been furloughed a few months back for 6 weeks. I have not been able to do a good portion of my work that would bring more income because of Covid. I have been paying my monthly payments to the Trustee on the regular basis. I am employed however and extremely grateful for that. 
I then received another call at my office even though I explicitly told the person I was speaking to not to call. I wanted to resolve this, but I did not understand why they were calling me and threatening more phone calls and telling me how this will be affecting my credit after I have informed them that I have a bankruptcy lawyer and that they could contact him if they needed confirmation. I did ask her if she is allowed to call me after I gave her my lawyer 's information but she did not answer. In my further conversation I asked if the amount could be lowered because I really did not know of this bill and it seems that most of it are just late billing charges. She said that I can send them a letter and that they will check with their client. I told her that I will do that and that I really don't have any extra money but that I will try to resolve this. Again I reminded her that I am in Chapter XXXX bankruptcy but that got her very annoyed and she became rude and told me that they don't deal with lawyers and that this is my problem. Then she yelled at me and said okay I won't call you any more. She said again that she doesn't talk to lawyers and she hung up on me. The next thing I know is that I received an alert from credit monitoring company that a negative item posted on my account. When I went to check I realized that it was this XXXX bill. I would like to see this removed and I would like to resolve this by paying the original amount owed of {$58.00}. I am considering suing this company. I find that their practices are extremely offensive, rude and demeaning. It could be just this one person I dealt with not the entire staff but that was my experience. This type of behavior needs to stop. Especially right now when we are all in some sort of dire straits.