You can contact your credit card provider and request a block, but i dont think stripe will do this.
Its always in a company's best interest to cancel if you request or provide a mechanism.
I would suggest trying to work it out with the company, then file a complaint with stripe and finally contact your credit card company to block future charges.
The solution to me is to not provide free credit, but to credit the creation of a new droplet for existing users. Many will scale up and not scale back down. If im on the edge if i need to throw another droplet behind the loadbalancer and your like DO IT, you've been a great customer so we'll give you a month free for the new capacity, am i going to risk removing it.... not if my product is doing well. its a WIN WIN. an offer like this would be awesome to roll out to loyal customers with semi-produciton work loads (2-4) medium+ droplets already. It solves the problem of incentivizing loyal exisiting customers, along with driving business needs of not burning money without a return. Also HMU if your looking for a SVP of Product or something like that, I clearly have some good ideas for you.
SMTP does both the sending and receiving for the server side. Email clients only use SMTP for sending, though, which is probably why you were confused.
personally i understand that father is involved and wants to help. But a valuable lesson would be having the kids write the investor update, learn to face the failure.
I get that they are only 11, but if your going to have them launch a business they should learn the ups and the downs. Otherwise just post your prototype on Hack-a-day and have it be a fun family project.
Its always in a company's best interest to cancel if you request or provide a mechanism.
I would suggest trying to work it out with the company, then file a complaint with stripe and finally contact your credit card company to block future charges.