Oil Change With Wrong Oil Spec 2015 Q5TDI-Need Advice

Had and oil change done and the wrong oil spec was used, the 505 spec was used vs. the 507 spec oil Will the high ash loading do much harm to the DPF over one service interval, 15,000 km?
The oil used was Liqui Moly leichtlauf 5w-40, it's sulphate ash content is 1.0 - 1.6g /100 g.
The Liqui Moly 507 spec oil's sulphate ash is: less than or equal to 0.8g / 100 g

I'd run it for an interval. Unless the engine is consuming a quart or more between changes.

I don't know whether it will harm the DPF, but if I had an oil change done and paid for it I'd politely ask they correct their mistake and replace with the proper oil. If it was me or my bother-in-law that did it I would still bite the cost of the oil and put the proper oil in.

If you are asking, that means you CARE about your car. Yep, have them put the right oil in.
Part of their job, is to check which oil is required, TDI or not.