Shortmax Charged Twice but Subscription Service Not Usable

I have been experiencing serious problems with my Shortmax subscription service, which I purchased and managed through the mobile app. On April 18, I noticed that I had been charged twice, even though I could not properly use the subscription service. Despite being billed, the service was not usable for me, and this situation has been both unfair and frustrating. I tried to cancel the subscription multiple times through the app, but the cancellation did not go through, and I kept being charged. Up to now, I have paid a total of $39.98 for a service that I either could not use or did not want anymore. I also contacted Shortmax customer service by email, but the email bounced back with a message saying that the email address was unable to accept emails, so I was not even able to reach support. I request that my subscription be definitively cancelled, that any further charging or attempts to charge me be stopped immediately, and that I receive confirmation in writing that the cancellation has been processed. In addition, considering that the service was unusable and that I was charged twice, I request that the total amount of $39.98 be reviewed and refunded as appropriate.