Xbox live charging multiple times

Anyone have any experience getting refunds from Microsoft? I was trying to order the ufc PPV from 2 weekends ago and I tried to buy the ppv but kept getting a “try again later” error, then I see on my debit card they charged me 6 times for the ppv even though I was never able to actually stream it. I sent a refund request through the website and got a “these Purchases are not eligible for refund” sort of auto response email. Today I went into chat to talk to someone and they just said we can’t contact the billing department directly and they can’t issue refunds. Do I actually have to go through with my bank and dispute the charges or is there a way to get them to actually do their job there?