There was an online service subscription I had several years back (not Twilio, but something somewhat similar) that I stopped needing. I forget if there either wasn't any way to this on their website or if it was just broken, but after repeatedly trying and failing, I ended up just disputing the charge the next time the monthly payment came up, and my bank stopped the transactions from that point on, so I forgot about it. A while later (probably around 6-12 months), I got an email from that company asking me to go back and tell my bank that the transactions were fine. Given that it had been so long and I only disputed the charge due to their website not giving me the ability to cancel through them, I didn't think it was worth trying to talk to someone at the bank to figure out how that would even work. It left an impression on me because it was the first time that I felt like I actually had any power in my relationship with a company as a customer rather than just having to hope that the company would chose to do right by me with nothing forcing them to.
