Dan Nelson Supercenter ripoff overcharge for a vehicle, told me to come back and they will pay off my vehicle but I don't have the credit Des Moines Iowa

I was recently contacted by dan nelson and was approved. But they still did not do what they told me that they would do when i bought the truck two years ago. which is pay my truck off completly and get me into a newer truck. too me that means not having to rollover any ofmy previouse loan. but instead they would only give me 2500 for my truck (i still owe 6000 diff of 3500)so that means that they tacked on the extra $3500 onto the new truck. i guess the thing that gets me is that is all that my truck is worth is 700 to 1900. and hate to say this but the person that sold me the truck even says that is the way that it was explained to him when he went to training. so that is why that is feal like i got RIPPED OFF. So when Dan Nelson in St. Paul MN reads this and thay will that is how i feel and if u want me to delete this you better do what u promised me when i got the truck.