The Mann Bracken/Walpoff people refuse to negotiate realistically. To the extent they do negotiate, the negotiation is a fraud. They will not live up to what they negotiate. For example they will take partial payments and then not reduce the balance as agreed prior to your sending the partial settlement payment. Do the public a favor and fight these people any way you can so their business is not profitable. Do not feel guilty about eliminating the enemy! I like what someone else wrote and have recopied it below.
Mann Bracken has a weakness-their lawyers. Refuse to deal with their collection agents. These people make $5 an hour if they're lucky and the rest is commission.
You will find a current list of the REAL Mann Bracken attorneys at johnpfryedebtlawyer.blogspot.com. Contact one of them and tell them to work things out.
If the lawyer you talk to does not, file a Bar complaint. You will want to file against them in Georgia, your state, and the state of the Mann Bracken office that contacted you.
A couple of Mann Bracken lawyers have been disciplined, and Branton could lose his law license at this rate!
Good Luck!