The exact same thing happened to me. In my case I still had a t2 instance running and was billed ~15$ a month. Eventually I shut down the instance over ssh, but

The exact same thing happened to me. In my case I still had a t2 instance running and was billed ~15$ a month. Eventually I shut down the instance over ssh, but that didn't change the overall situation. I was studying in Germany at the time and access to a notary public costs about 40$ USD there. I asked the AWS support on the phone if letting the payments bounce would suspend my account which they confirmed. Unfortunately every time I disputed the payment with my bank, AWS send me a physical copy of their terms and my billing address as a proof of contract and my bank would process their payment. Eventually, 3 months in, my credit card expired anyway, solving at least that part. They still tried to charge me for about 6 months afterwards, but I haven't heard back from them since. Interestingly, I opened a second account, with the exact same billing address, but a different credit card without problem. But I don't really use AWS anymore since then. I totally believe that they (AWS) just stuck to their process, which was enacted in good faith. But switching my phone number should have not caused that entire fiasco.