You told them to install PH8A and they installed something else, without your approval? That's a problem. Now you've got to make it their problem.

OTOH You've got a non-stock vehicle. You can't expect them to be able to figure out what you've got going on there. You can't depend upon this to be reliably communicated between the person at the counter and the one that does the work. You need big obvious stickers that say.

USE ONLY THESE FILTERS. followed by list of proper filters, in several popular brands Wix 5xxxx, Fram HP1, Fram PH8A, Fleetgard, etc.
USE THIS MUCH OIL. followed by the proper amount of oil, and or your favorite brand of oil.
USE ONLY THIS TYPE OF OIL followed by the API oil spec. and weight.

Got an owner's manual in the glove box? Paste the same thing over the pages where a competent mechanic would look on for oil ratings and capacities. Better yet. Get a 123 owners manual and cut and paste the two to make one that matches the vehicle. A print shop can bind it up for you.

I'm not trying to put the blame on you, but it sounds like there are a few things that you could do to make this much less likely to happen again, or at least make it so only a real bona-fide idiot could install the wrong stuff. Carry extra filters for your vehicle with you. Keep a case of filters in your garage. Shop doesn't have your filters? "That's okay. There's a pair of filters with the spare tire." Find a shop you like and stick with them.

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Remember, Safety Third!
'99 E300 Turbodiesel, '82 300TD, 1996 12V Cummins Turbo, '94 Neoplan - Detroit 6V92TA