I would have refused to pay as they replaced something which did not resolve the original issue. In your situation, servicable or not, it should have been waived under the circumstances. 
	Quote:
	
		
		
			Under your specific circumstance as 3 have been replaced, that is why I would have refused.
			
		
	
 Just what I would have done. I don't get angry with the dealers but I certainly ensure I know my rights and what is fair. I would always pay for what I should, don't get me wrong, but I would have only paid up for the new filter once they resolved the main issue.