I recently did exactly what you did. I paid 3 accounts I had with Midland that were eligible for PFD and immediately disputed them, probably 1 day after I paid them. That may have been a mistake on my part. I had to continue to dispute them from each of the credit bureaus because for some reason they were not coming off. I disputed them through the Midland website on top of each burearu as well. They all eventually came off my report but I think if I could go back I would probably just wait the 30 days they say and if they weren't removed by then I would dispute. I was impatient just like most are but I've come to realize this process is a mararthon, not a sprint. Good luck to you.
I would just wait for them to do their thing. They will get it done it is their policy now to remove them if they say they will. If its not done in a reasonable amount of time 60 days or less then I would contact them to see whats up. Welcome to the board