Pay for Delete? Want to do it the right way

[credit-credit]

I have two medical items at a CA.

 

One is on my credit.    Dental company.  

 

The dental company zeroed out my bill as a courtesy.  

 

They sent me docs to say my account is paid in full.   Actually that there was no bill aka I owe them nothing. 

 

Now, if I send that to the CA (radius solutions) will they totally remove the mark on my credit, or just keep it on there and say 'PAID IN FULL'.

 

I would rather have it not even listed....aka totally removed from my credit reports. 

 

 

The second one, Quest Diagnostic, is with radius solutions CA as well.

 

Now, if I pay radius, they say they will mark it paid in full.  

So do I pay direct to Quest?    And how do I make SURE that the quest mark, if it lands on my credit, is deleted?

 

 

Thanks

 

Credit-Credit