Speculating, but using the expected turn in date rather than the date scheduled would seem to be the most likely glitch. Since you could put in a date all the way out to 12/31/2018 early on, if that date continues to be used through the rest of the process, it would inflate numbers by miscomputing the number of months to give the 1042 credit for. Once getting to the offer stage, it would seem that they would have to generate a couple of offers depending on which of the 3 months you pick the turn in date in, and the miles each is valid for. This would likely create even more confusion, offer 1: month 1, miles x to next 5k, offer 2: month 1, miles from next 5k to next 10k, offer 3: month 2 miles x to next 5k+1042, and so on. Folks can't figure this out on their own, presenting them with 6 offers based on the month you return, and the miles at the time of turn in will not turn out well.
Stewie here, I am going to try and reply to several posts here to confirm what happened.
Firstly, the majority of you folks on this forum have a far clearer idea of how the program works, than the majority of the Audi folks I have talked with on the phone for at least six hours over the last 24 hours.
I went through some printouts I made of what I saw on the site back on August 28th, 2016 when they first provided that worksheet that would come back with various offer numbers depending on what surrender date, and what projected mileage you put in.
I tried a variety of surrender dates using my very low (50 miles/week) mileage accumulation rate. I distinctly recall my offer amount did not change one dollar, even going all the way out to september 2018. I recall hitting sept 2018 as being the absolute last month you could put in.
In my mind, any time out to September 2018 I would be provided the $37,726.73 amount, provided I did not drive more than 12,500 miles per year.
Entirely possible I left that worksheet with the August 2017 date as my last, "let's try this combo and see what the offer is"
As the months passed, I recall getting various notifications that the portal had new pages, and new requests for information. I had to upload my title, upload my registration etc. I did all that.
Was delighted to be notified that all was well, and to download the offer letter. I do not recall being asked to reconfirm my surrender date at that time, or to reconfirm my projected mileage.
The offer letter was consistent with my last worksheet. Key point here; The offer letter in no manner repeats back what you selected for the surrender date and the projected mileage. Had there been a sentence like: "Amounts herein reflect your indication to surrender your vehicle August 2017 with an estimated mileage of 28,000 miles. Should you decide to surrender your vehicle earlier or later than date shown, or with accumulated miles different than what you estimated, your final settlement amount may be lower or higher than is what's shown in this letter" much pain could have been avoided.
When you input your mileage when you select your appointment time, it would have been nice to see a pop-up "The mileage and appointment time you have chosen do not match what's in your settlement agreement and may result in a settlement amount different than what's in your offer letter. Do you still want to proceed?"
Lesson learned: By the time you get to being able to download your offer letter, whatever surrender date/mileage has been baked in. Understand that if you go off of that, despite there being no specific reference to said mileage and timing in the offer letter, you will be presented with a value that is different. Despite all the official looking nature of the offer letter, they will pay you based on the charts.
As soon as I can get the TDI Pics working, I will come back and upload my offer letter.