Refund Required

I was on the Microsoft 365 trial subscription, and cancelled it last week in order to not get billed as today was the final day where i would get billed. This morning i woke up to find that i was still charged for this subscription and its money i cannot afford to have deducted from my account. I am trying to get some contact to assist me with how i can get refunded but microsoft has no email contact i can find and also the numbers i try calling just says that everything has now moved online, but there is nowhere online that i can find a way to assist me with my refund which i really need urgently. Can someone please contact me or send me an email address i can contact so that i can request my refund IMMEDIATELY!!!!!