How to cancel the charge due to accidental Azure AI usage as a learner using trial ?

I’m reaching out with a bit of concern and hoping for some guidance.

I recently started learning Azure Foundry as a beginner and was using the platform on a trial/learner basis. Unfortunately, I made a mistake — I forgot to delete one of the resources I created while experimenting. I didn’t realize it was still running, and now I’ve been unexpectedly charged around $2,000 for the month of November.

This was completely unintentional, and the charge is a huge amount for me. I’m really worried that it will be billed to my credit card.

Does anyone know the best way to request a bill cancellation or credit for accidental usage on an Azure subscription? What steps should I follow to open a support request for unexpected charges?

Any help, advice, or similar experiences would mean a lot. I’m trying to resolve this as soon as possible and make sure I don’t get charged again.

Thank you all so much for your time and support.