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At this point you are simply guessing - you will need to call and ask questions from the source to get the information you are seeking. You think you paid in full, they don't - call and find out why.
Whether or not you paid in full won't have much impact on your scores anyway. You want to aim for removal of the derog.
Correct, my full intentions are to have it removed 100%. I was just curious if thats indeed what they were saying.