Leigh,
It seems like you are "stressing out" over the wrong issue here. What other posters are saying here is that the owner of these points could send you a confirmation number framed in 14K gold, and it STILL would not be worth the paper it is written on if they are "crooks" and want to take you for a ride. The fact that you have confirmed the ressie via the 800 number means that they have carried out all of the "significant" terms of the contract.
You're not happy, and I understand that part. But, let me ask you this. If you were 100% guaranteed that the reservation would not be touched, and that you would have a room when you check in, would you be worried? Probably not. So, the problem seems to be the "trustworthiness" of the renter rather than the lack of a piece of paper in your hand. So, I HAVE to ask you this question....why did you rent? Are you a current DVC member? If so, did you know that renters can transfer points into your account? Did you rent because of your desire to stay in a DVC property? If so, did you know that WDW also rents these rooms just like they rent any other WDW hotel? Did you rent because it is "significantly" cheaper than the rack rate offered by WDW? If so...then, understand that your frustration is the price you MIGHT have to pay. The renters ARE getting that legendary DVC service. You, since you are NOT procuring your stay via WDW...you are not. I'm sorry if this post upsets you, but there probably was not a "level of service" guaranteed in your contract. You paid for a reservation, and you have a reservation. Now, you do NOT have a confirmation letter in hand, but if the renter made your reservation, sent you the letter, and then cancelled, saying "Well, you have your letter, what more do you want", you would OBVIOUSLY argue "A place to stay!!!". So, you have the more important of the two. Let the whole "letter" thing go...and, chalk this learning experience up as "You get what you pay for". Granted, SOMETIMES you run across wonderful renters who go above and beyond to make sure you are "comfortable" renting from them....they don't HAVE to do that....they just have to procure you a room at your specified resort...that's it.
Did the renter give you the 800 number? or did you find that somewhere else? If the renter gave that to you, that shows a good faith effort right there. The renter KNOWS you can call and check on your ressie anytime.
The other point I wanted to make is this. PLEASE let the renter know you are unhappy. If I were ever to rent my points, I would want to make the rentee VERY happy because I would liable for all damage done to the room during their stay. NO WAY would I ever want someone who I 1) did not know, and 2) knew was angry with me to stay in a place where I would be financially responsible for their actions. I'm not sure how "upset" you have let the renter know you are, but I would certainly let them know. That might be just what you need to remind them of to get your hard copy (although WORTHLESS) of your confirmation.
Anyway, I'm sorry this has been very frustrating for you. There are SO many wonderful stories of renting...sometimes, we assume they ALL are that way. But, if you ever try to get down Main St. after a parade, you quickly realize that not all Disney guests are as "Magical" as we would hope...sometimes, this goes for DVC members as well. Although, I am in agreement that this person might be renting because of personal turmoil or tragedy. Just be happy that all is well in your family, and that you are getting DVC at a GREAT price!!!
Have a wonderful trip,
Beca