CIR Law office settlement.

I got my wages garnished because of default judgement. I won't go into details regarding the documents, however, when I called this CIR office that is located in San Diego, CA they are willing to settle with me less than the garnishment amount that will be taking out from my paycheck each month. The woman that I spoke with, Natalie, said that she will send me the settlement letter, then they want me to put cash of the settlement amount to their Well Fargo account so this way the garnishment can be lifted before my employer withheld it. Then I have to fax them the receipt that I have put the money to their account. I am worry that even though the settlement letter is sent to me and I put the money into their account, they might turn around and collect again or continue to garnish my wages. Has anyone experience them promising you this, if so does the settlement letter that they will send is sufficient enough as evident that agreed to pay the amount settled? I just don't want to put the money into their account then nothing will happen? Is the company trust worthy? Help me please I only have a couple of days to decide this. Thank you guys!