Charges

How do I get to talk with someone about the erroneous charges that appeared on my account in April. There were 6 in total and when I asked for a refund, 2 of them were actioned by the next day but the other 4 were not. All 6 are fraudulent activity so
why only the two refunded. I always get an email within a few minutes of purchasing something but for these 6 items I did not get any emails. I have checked spam etc but nothing there. I have purchased something this afternoon and got an email within 10 minutes.
I want someone to look into this and explain the different between the 6 items as I am properly frustrated by MS. Sent loads of emails but no one answers.

:)