Cancel Unwanted Subscription - ShortsWave

I am writing regarding unauthorized charges that Shortswave continues to make on my card, despite my cancelling my monthly subscription. For months I have wanted to cancel and already deleted my Shortswave account, and I then formally requested cancellation of my monthly subscription on 10 August. After deleting my account, I was billed three times for a service I no longer wanted, and even after my formal cancellation request on 10 August, I have still been billed once more on the same card. One of the recent transactions is a charge of USD 17.99 (GHS 214.63) earmarked on my account ending 5177 on 24 August 2026 at SHORTSWAVE_8618914746335SG. I am using the service from Ghana. I have already tried to contact Shortswave customer support about these continued charges but have received no response at all. I request that my subscription be fully cancelled immediately, all charges made after I deleted my account and after my formal cancellation on 10 August be refunded to my card, and written confirmation be provided that no further billing will occur.