Do you prefer e-mail correspondence or phone conversations?
I caught a salesperson in a lie. They had all sorts of people backing them up and trying to make me out to be the liar. Then I forwarded all parties the e-mail with the lies and requested apologies from all involved.
Since they didn't feel they needed to apologize for being liars nor calling me a liar, I thought it was only fair to forward the invoice where I spent over $10,000 with a competitor because they are dishonest and I can't do business with dishonest people.
Had it all been done on the phone, it would have been a case of he said vs. she said, but I like everything in writing. Paper in the old days, e-mail today.
Do you think the vendor I caught in a lie feels bad about losing a $10,000 sale? That probably would be the kind of sale they only get once a year. Not only did they lose the large sale, but they lost countless small sales I make on a regular basis. This is why i will not do business on the phone or if it is in person, I still get it in writing, because I have yet to find a salesperson with much integrity.
I prefer email when it involves any discussion of duties or obligations.
Many people do not realize that an email is a "written document" that can contain an "electronic signature" (i.e., their name typed at the bottom) that can be used as evidence of an enforceable contract.
Note also that rubbing their noses in their mistake was probably not "productive" for anyone. You can simply take your business elsewhere and leave them wondering why you never came back... Now you may have made them jealous of their competitor who "stole their customer".