Eyekid Subscription Still Charges Monthly After Cancellation

I had a membership in the Eye Kid app, which I cancelled on 16 April. Despite this cancellation, my credit card has continued to be charged as if the subscription were still active. Although I cancelled on 16 April, ₺442 has been withdrawn from my card on 9 May, 9 June, 9 July and 9 August. I did not approve these payments after the cancellation and I was not informed that the membership would continue to be charged. I request that my cancelled membership be completely terminated in the system, that no further charges be taken from my card, and that the total amount collected after 16 April be refunded to my card.