How to get them to leave me alone for good?

Okay, long story short, I've been fighting Midland for the past three years and though they finally got the hint. I had 2--mind you only 2--cc go to them for collection long after the sol and long after the original creditor had left my report but then I ended up with 15 listings for Midland. I challenged every one and one by one they didn't validate and were deleated, then they started listing one every month with a 30 day time on it. Last month, I challenged everything on my report again dealing with midland and all but one was deleated. Then last night they added another listing with a new total amount, a date of 10/10/10 and a 30 day time on it. What can I do to get them to finally go aweay for good? I hate to think I have to fight them every month until they go bankrupt or I die. My credit score went up 30 points when they were deleated and went down 5 point for the new listing. This is getting beyond ridiculous.