Usually, it is difficult to negotiate anything with XUV700 purchase. My friend purchased his car recently and used his Magnus Burgundy card. He had to pay 1.5% surcharge. It was sill worth it.
I think both POV has their own merits but it solely depends on the individual. Some people may want best miles value by doing minimum investment while others just want to maximize miles value by making additional investment.
Personally, I would never pay extra money to get business class ticket...
I had something similar but they confirmed on email that it is a technical glitch. You may email again just to confirm. Eventually, my transaction was cancelled by BMF due to unavailability of currency so can't comment on reward points.
Dear Sir, there are so many threads already discussing this issue. I would suggest you to do a quick search on the forum rather than posting a new thread.