Cry for help: Stripe subscription disputes

Hi gals and pals,
tl;dr customer is daisy-chaining disputes of being charged after claiming that subscription has been cancelled (I received no such request), which negatively affects my standing with Stripe. So my questions to you are:

1. How do you mitigate such risk?
2. Have you ever won such dispute? If so what evidence have you presented?
3. [Stretch goal ] Keen to share your onbaord/offboard design, which makes proving to the bank that the customer had not requested cancellation bulletproof.

I have the following predicament (to say it lightly):
I am running a one-man show SaaS with monthly subscription plan. Now, in order for customers to cancel the subscription , they need to reach me via the in-app chat or just send me an email, which works reasonably well.
There is however sub 1%, which prefers to open up a dispute with the bank and claim, that they have been charged after cancelling the subscription (which they did not), for collecting a cool month worth of payment back. I usually just swallow it up.
However, I have now met a new breed, which opened up this kind of dispute. As per usual, I have contacted it over it (always do, but nobody actually cared to reply) asking to revoke the dispute if I would in exchange refund it a month worth of sub, to which it agreed. So I promptly fulfilled my end of the agreement and recorded the refund taking place on video, packaged it all up and sent it to it asking to fulfill it's end of the bargain. Then 4 days passed, with that opened dispute still pending and finally today ... I have received another dispute from it, but now over a different month! Given that it stayed over 6 months with me (so potentially can open up disputes on all of them), it now has an ability to single handedly pluck me over and needless to say I am at total loss how to deal with it. I did sent an email to Stripe explaining what's going on, but I feel like it gonna fall on deaf ears.
Emotions aside, how to prevent it going forward?
Do you have a protocol for customer onboarding/offboarding, which would reasonably satisfy banks, that request/action for cancellation was not performed by the client?
I have read that banks want to see that you do not let customers pay until they read through terms and conditions (ToS), which explain how to cancel the subscription. I am willing to go a full mile to completely redesign my processes (if I would not be banned by Stripe), by introducing the subscription management panel, the pop-ups with ToS, etc...
But then again, what is stopping the customer to claim he or she did click the cancellation button, but were still charged afterwards? How do you deal with it?