What happens to collections when you pay original creditor

Thank you first for taking the time to read and answer my questions.
I sent the dispute letter to Audit and Adjustment - they sent me a letter back that says they marked the account as disputed and will be reported to the national credit reporting agencies.
Mind you I did not change your dispute letter at all. Also I was told that if I could get valley medical center to cash a check - that that means I am working with them and they are working with me - cutting out the collector per say is that true????
I did not a get a validation of debt from audit and adjustment. I don't know what to do now...And as far as I can tell the bureaus aren't really checking into things - because I have paid off a bunch of stuff and it still hasn't changed my report any. If I missed something in your writing would you let me know where to go read again please.
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prompt bureaus to work for you with the dispute form on those paid bills.
say not yours or error audit and adjustment?
is that a collection agency?
if so validate the debt not just dispute? not sure what happened here
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Valley medical did cash my check.
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you should be able to rid yourself of the collections thenask valley medical to helpreally you should have hasked them before you paidButthey may still help you