Hotmail is conflicting with OneDrive through my Microsoft 365 account

I've been struggling for about one month, thus far, with my OneDrive through my Microsoft 365 account. Suddenly, my 40-year-old Hotmail account is frozen, and I cannot send, nor receive email because, the system indicates, my OneDrive is full. When I click on that, to be led to my OneDrive, it shows that I have used less than 0.2 GB from the 15 GB allocated space. In the meantime, I cannot use my Hotmail, where I have deleted about 10 GB of files. This has not helped me, and I cannot reach someone from Microsoft for assistance. Does anyone have any clue about how to resolve this mystery?