Creditors are trying to collect and have changed date of last activity.

I have taken a bit of time to call some of my creditors. They are all telling me they won't negotiate on anything. Should I just send them letters using the formate you have provided? And not call them. I used your validation letter sending one to every collection I have that isn't currently on my credit report. I think I got it straight but would like to make sure. After sending the validation letters I would then have more information to contact the bureau's regarding incorrect information etc. Which I also somehow need to include to the bureau (I don't understand this part) not to have the dates changed? I don't know where that comes in and I didn't notice it in any of the letters.
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yes they must have proper documentation is thy are second party collections
if they are first party creditors pay them if you can.