If you agreed to a different date, but ORALLY only, I WOULD NOT trust that the agreement will be enforced. You should follow up the oral agreement IN WRITING and direct the correspondence to the legal department, as well as to the person who you made the agreement with.
I am NOT saying that the collection agency isn't trustworthy. HOWEVER, when you don't have agreements put into writing (especially one as important as this), people tend not to remember that they agreed to the date, etc.
Again, direct the letter to the lawyer and person who you spoke with. You may wish to indicate that you spoke with xxx on xxx date, and that xxx agreed to the following terms:
1. On xxx date, I spoke to xxx person/lawyer, etc. That person (name) indicated that s/he had authority to enter into an agreement regarding file # XXXXX;
1. It was agreed between the parties that file # XXXXX to be paid in full by xxx date;
2. If file paid in full by xxx date, collection agency will either NOT report any negative remark to the credit reporting agencies, OR will WRITE a letter to the credit reporting agencies (with a copy of the letter to you) that removes any negative remarks.
3. That unless you receive documentation indicating anything contrary to the above, you will consider this agreement to be fully enforceable in (whatever your city, state is).
4. Include any other facts that you think are relevant to the settlement of the matter.
My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back, I am happy to address follow-up questions. Thank you for your business!
***Answers given are for informational purposes only and are not meant to replace the advice or assistance of an attorney licensed to practice law in your state. If you need any more information, please do not hesitate to ask. Thank you!