Has anyone had experience with disputing info on their credit report causing their score to decrease.?

I recently (about 10 days ago) sent each bureau a letter disputing some accounts and inquiries on my report. I use Score Watch to monitor my score and yesterday I got an alert stating that info on my report had changed and my score dropped 20 points. The change in my report was the disputed items noted that the consumer was disputing validity. Can I argue this decrease with the credit bureau? And if so, how? I didn’t think I could be penalized for submitting dispute letters.

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