Settlement without written Terms & Conditions

Has anyone ever paid 35% lump sum with LVNV Funding prior to lawsuit without first receiving a written agreement for PFD and that the lump sum will settle the debt collection?

There is a balance of $602.67 with LVNV Funding. I disputed it, but I really would like to just settle it. I managed to negotiate a lump sum of 35%, but I just wanted that agreement in writing (sent to my email) prior to arranging the payment.

The call started Resurgent, then transferred to Credit Control. The representative I spoke to said I can take his word for it because he’s a “supervisor,” and that I would receive the written agreement until I schedule or make a payment. He also made a big deal about me wanting to pay via Money Order.

Anyways the $211 lump sum turned from only being good today, then turned into being good for the month of September.

I’ve read that it’s best to pay via money order rather than using a debit card and ACH.

Has anyone had this experience with this particular company? Should I trust a verbal agreement? By the way I recorded everything.