[kelnos]

If choosing to go this route, back up any data stored on Azure, and start looking into how to migrate everything to AWS or GCP or something else, without incurring too much downtime. Refusing to pay the charge, issuing a chargeback, or even getting a lawyer involved could get OP's account terminated, or at least suspended.

[amerkhalid]

Or even go back to good old VPS/metal servers. Maybe a little more work upfront but less likely to have surprises like this. Also more competition in that space and no worries about vendor lock-ins.