Unfair treatment to clients

So MBD has been harassing me for some time, then a lady called from the attorneys with an attitude telling me I must no telephone ettique while trying to explain to her and telling her that she's rude she drops the call on me. Now few days later I receive an sms saying I should call them since they discounted my settlement, I could not call due to the fact I was in hospital. Following week I get a call an I told the lady assisting me that I received a message bout discount stating to her that I only have X amount coming and I wanna settle. This lady insists that she can't assist and I should pay or else I will be blacklisted while iam kindly asking for the discount amount she hesitant that I pay full which I tell her I don't have. I request for management instead she says she will get back to me. In a few hours she calls and says she cannot assist with discount instead I should pay the money I have as installment. I tried explaining my situation but she was more adament in me paying that amount asap (I guess it's commission based company). We ended the call by her saying she will get back to me on Monday and try to get a discount for me. Guess what no call but constant sms demanding for installment