recieved letter from collector, they will not respond being frivalous

Thank You for the advice about the dispute letter. I have just recieved a letter from a collector that has told me they are not going to respond to my request because I am being frivalous. Now, should I send my debt validation letters to the credit bureaus in this case or send the validation follow up letter? Thank you.
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ok
dsiputes go to bureaus, who then send them to creditors. bureaus usually respond with a "frivilous", not creditors.
debt validation lettters go to collectors or collections and most collections are not legal. These collections are sold for pennies on the dollar in many cases and provide a very high rate of return if the collector can actually collect. Collection agancy's can try to collect BUT, you cannot be sued or threatened of a possible suit and the collection cannot be placed on your credit report, if, the item has already been put on your report by the original creditor.

so send the debt validation letters to the collections