I was advised by my college to get a free subscription for Azure for a limited number of hours, They told me my credit card would not be charged without my prior consent. I could not get any access to Azure as I did not have enough units of something and I wrote to Azure support. I never had a response from them. I have never used Azure. I insist that you return to me 44CAD and never charge my credit card again. What shall I do to stop my credit card from being charged by your corporation?